A newb needs help

Hello everyone as the name's say's i'm a poonewb.I have a couple questions so i hope someone might help me out. I bought a 2000 xc 700 Deluxe for a $100 you are saying it must be a pos but it is not needs a roller in the clutch replaced. On to my questions

#1 My new sled dose not have a boost bottle on it so i want to know is there a bennifet to having it and do i need it?

#2 I'm going to take the carbs off and do a good cleaning on them so i would like to know what to set the mix screws at??

#3 Any aggresive clutch setup example---clutch arm weight

---helix & spring.

thanks.

Sorry one more question for now what should the oil mixsure be at as far as when i pull the throttle where and or when should it activate the oil lever?

Ok guy's i'm sorry i'm sure everyone is sick of my question but i have another one i'm going to put in a pic of my carb i need to know what to set the screw at in the pic one carb was set at 2 full turns and the other at 3 1/2 turns and i know this is not right. i need to know not about the black slid screw but the lower one please. Also what should the comprestion be on both side's of motor. thanks.