Research spells arent a HUGE deal, just if you want to get the spells first then youll pay a pretty penny. But if you can wait then eventually everyone and their mom does resarch and spells go to like 50-100p each. I remember in beginning I was paying like 300-400 each and that was my whole piggy bank while leveling. But I'd pay 300 one week and next week spell was down to like 150, and I was ahead of the curve. I would keep hides to help offset the cost the researcher was asking. NEcro is fun but if you can box then make a mage too, lot of their pets arent research and they can just chain pet their way to 50 easymode. I remember on my necro I had no gear so I was always oom (necro pets cost more), but once I boxed my friends 2 mages it was like wow mages are low maintenance mana wise, pets last so long and regen 10% out of combat health a tick (think was higher % at lower levels).
Shamans are fun but I remember no one really mained them in classic bc ya you were the buff bitch of the raid and you had to single cast every buff, and no one played them so in the odds you did, you were probably the only shaman in the raid which made it worse. People wouldnt even bring their shaman boxes cause they got annoyed with how many buff/person it was. But I boxed nec/shm and loved my shaman for soloing camps etc.