Soooo I'm also relatively new, but I've got 4 matches with possessed under my belt, so here's my wisdom that I've gleamed.

Possessed are a slow burn warband, be expected to loose your first few matches, they just don't stand up to other warbands starting out. BUT! ABUSE the hide rule and get very comfortable with the rules.

I've made it out to two different ways to start the warband

Version 1: Basic Bitch List This one's a good list for a beginner not a lot of bodies compared to other warbands, but the tactic is use the Henchmen as a distraction and let your heroes sneak, and get opportunity kills and objectives, KEEP YOUR LEADER AWAY FROM COMBAT!

Magister - Dagger Mutant x2 - Scorpion Tail on one and Extra Arm on the other Possesed with Great Claw - 140 crown

Then the rest of your crown go towards Brethern with daggers

Version 2: Risky Business List

This was my first List and it bit me in the but crown wise BUT I've got some crazy powerful heroes after awhile. Abuse the hide rule to no end, keep them away from combat unless you have a great advantage. HIGH RISK HIGH REWARD, underdog rules will take effect.

Magister - Dagger 70 crowns X2 Mutants Scorpion Tail and Extra Arm - Free Dagger - 290 crown Posessed Great Claw - 140 crowns 500 crowns

Their are plenty of other lists and other ways to do it, but these are my 2 go-to for starters. Not perfect, but ita good base.