Silly armor questions. Follow

Ability Mod itself is a math equation. So an example would be a spell or heal that does 1000 damage (without crits or AA, just go with it). Ability mod adds to the base amount (and crit amount) of that initial 1000. It does have a cap though, its 1/2 the spell damage. So if you have 499 ability mod, your spell will now do 1499, but if you have 502 ability mod, that spell will only do 1500...because half of 1000 is 500.

So the larger the damage/heal amount on your abilities, the more ability mod you benefit from having. It does effect dots, and heal over times as well as crits like I mentioned.

Every character can choose a God to worship. Each God has a series of quests that allow that character to become a follower. There are several rewards including one at end of the quest chain that gives you a nice pet. IRRC, you'll need to be somewhere in your 50's or 60's to complete the chain although you can begin it much earlier.

But we have guides! http://eq2.zam.com/wiki/Deity_Quests_%28EQ2%29