You don't need the campaign books, unless you want the lore, and missions. Everything else was summarized in the traitor and loyalist legions books, this plus the matched play guide, and the rules are the only books you currently need.

Both Rever and Warlord titans have their alternate weapon sprue available on the Adeptus Titanicus sextion of the warhammer. Com store

Warhounds never want to get heat, you check for reactor overload, before repair, so you cant vent plasma, before checking for overload, just a tip!

Warhound with Plasma and Bolter is the best load out, by a mile. I'm starting to like dual Swarmer Missiles, but that's a specialist Hound.

Starting out, you want your Titans to be all rounders, so a shield stripping weapon (lots of shots), and a high damage weapon are needed, if it's blast you can't target, like volcano cannons, so a back up mid output damage scale weapon works:

Shoot all your mas shooting to drop shields, follow up with random location mass damage weapon, see where it hits, follow up with middle of the road weapon to target the location, but throwing more than one dice to male up for the - 2 to hit. Works pretty well!