question about holy priest or disc

I've leveled 3 priests in classic slash tbc all with the shadow priest route at 40.I've never played wrath as im new.Is it possible to dps with holy or disc.I freaking love healing dungeons but I struggled to.quest . I mainly solo because I'm retired and play alot. My real question is if I'm not healing is there a good dps skill in holy? Or is it like smite 5 times and wandThanks and I'm.hypeI'm going skinning and tailoring