1. there are a few catacombs available. those that are active you can find in the world map (Dark omen, Discples, Patriots, Forbiden path, witch, devotions)
2. the spell before level 40 you either dont need a spell book anymore or they can be bought in gludio in the grocery store.
3. l2wiki.com how ever it is not very up to date but it is 75% still correct for the lower levels.