Hm, okay. The area I assume you are talking about (From the bonfire by the first crossbowman in the burg to the boss, the Taurus Demon) is one of the areas I had to repeat the most on my first playthrough. It's not hard for an experienced player, but it's the first area where a new player is forced to learn the basics of combat. The boss at the end is no slouch either, although there are a few tricks which nearly trivialize him.
At this point I guess it doesn't hurt being specific to get you going.
First off, I assume you've found the bonfire in the Burg? Right by the crossbowman? That should be your starting point.
Moving out of that room, you should be able to take out the crossbowman and the 2-3 hollows charging you without taking significant damage. Try not to rely on your shield too much. Lock on to and circle strafe/roll the hollows, they will miss. This minimizes damage and stamina drain and is a good habit to learn. Avoidance is your first line of defense, blocking is your second. There's a new shield for you right underneath the crossbowman which will reduce the damage you take while blocking.
The two spear hollows nearby are good for practicing parrying*, but let's get the basics down first. Provoke and avoid their attacks by moving in and out of range or circle strafing, wait for them to miss, then hit them. Lower your shield when needed to let your stamina regenerate quicker, you don't need to raise it until just before getting hit. There's a merchant right under the spear hollows (break the crates), which can sell you a Heater Shield with which you take no physical damage while blocking if you feel you need it. Don't be ashamed to clear this little area with the crossbowman, the wimpy hollows and the spear hollows a few times until you feel comfortable fighting them, and get a couple of levels. By the way, I recommend leveling endurance early on, it lets you roll, attack and block more. Never level resistance.
When you feel comfortable with that, start moving towards the boss. Run across the bridge which is being firebombed from up top, meeting 3 hollows. Don't try to block the attacks from all 3, they will drain your stamina. Move around them to avoid their attacks instead. Kill the two without a shield asap, then duel the last one. They might still hit you once or twice, so you'll often have to use a flask after these (4/5 charges left).
Moving on, enter the open door on your right and kill the lone hollow. Just block or outrange his attack and hit. Head back outside.
Next, up the stairs for another trio. The two melee hollows will charge you, just move around them and towards the firebomber. When he throws a bomb, roll towards him. Kill him asap. The other two are just dumb unshielded melees, do what you have been doing. You might get hit once or twice here too, so that's another flask charge (3/5).
Don't worry about the firebombers you ran underneath earlier, killing them is more trouble than it's worth. Kill them if they climb down for you, otherwise ignore them. Next, move up the small sniper tower and take out another crossbowman. Just hit him from the stairs, he'll fire over your head. Go back down. Double check that none of the firebombers have come after you, then move down towards the 3 shielded hollows. Try to pull them 1 or 2 at a time (proximity aggro). Use your technique from the spear hollows earlier - move in and out of range to provoke an attack (which misses), then hit. Finally, pull the last hollow on the stairs and dispatch of him in the same way. You might misjudge an attack and be forced to heal another time on one of these (2/5 charges).
There's a big guy with a big sword down to your right, ignore him for now. Killing him is absolutely possible at this point, but if you're struggling already, I'd wait a bit. Come back when you've learned how to parry.
That's it, you can go through a fog wall which will bring you to the boss guy, usually with at least 2 charges left in your flask. If you're feeling confident, go through. If not, run back to the bonfire, use your souls to level up some more, and repeat the above until you feel ready for the biggest challenge yet. Once you do, enter the boss room. Immediately climb the ladder to your right and take out the two hollows, then you're ready for the boss. He's hard, but here are 3 basic tactics:
1. Stay close, roll around or between his legs when he hits. If he misses, hit back a couple of times, then repeat. If he hits, use your next attack opening to heal instead.
2. Buy a residence key from the merchant I mentioned above, then open the door behind the firebomber and 2 melee hollows to find Gold Pine Resin. This is a consumable which buffs your weapon and will make your attacks several times more effective against the Taurus Demon.
3. Use the drop attack trick you learned in the tutorial. Climb the tower, drop down and attack. Repeat if necessary.
Praise the sun!
*When you want to learn parrying, go to the spear hollows and let one of them get close. When he goes to attack, press parry when his HAND moves forward. "Parry the hand, not the weapon". The spear dudes have only one attack animation, so they are good for practicing this. Parrying is super powerful, but only humanoid enemies can be parried, so you need to learn to fight without it too.
PS: You have a humanity counter in the upper left corner, which sometimes increases when you kill stuff, or it can be increased by consuming a Humanity item. It drops to zero when you die and fail to recover your souls. Farm a bit, or just use two Humanity items, to get this number to 2. Then, go to the bonfire and regain your humanity, then kindle it. Enjoygetting invaded.