I don't pretend to understand what all these rules are, (what "pick point" means, the jester role, and the entire concept of zombies rather baffle me)but anyway
IN
Pick point means that instead of being assigned roes and traits, you pick your own. So instead of being assigned the Seer role, you're given 11 points. Then with those 11 points you can either actually choose to become seer(see the table in the roles for full costs of all goodie roles/traits) or you could choose to do something like become Priest and also have the Plotter trait, or take like five small traits. The recommended strategy is to buy as powerful as a role as you can, since you might be the only person with 11 points so if you don't choose seer we get no seer, but it's up to you.
The jester role has an ability that changes the ability of another player for one night. Say I'm jester, you're priest, and EURO is a wolf. I target you, you target EURO. Normally your priest scan detects nothing when you scan a wolf. But the jester ability makes you have a 25% chance of having a seer scan and detecting EURO. Or you could get the 25% chance of a sorceror scan and nothing happens still. See the page about the odds of jester's abilities to see the full list.
No one understands the zombies, and no one cares anyways, it's more fun to focus on the names johho came up for them which are parodies of well known werewolf players.