Plz give me some tips....?

Me n my friend are gonna move out in january to my trailer, we are both living with our parents right now...my dad bough two trailers when me and my brother where younger so we could both have one, they are both payed off, i will need to pay a lot note of almost 300.00 plus utilities(how much should be exspect to pay for utilities)..we also each have two pets she has a pomeraian & cat n i have a border collie n shih tzu...I already pay for every thing for my dogs and she pays for everything for her animals already so we know the expercies on them :(...pets r costly) oh n i have a betta but i cant rlly count him(harlow <3) ok im 17 n she is 18. I know she will have to go under contract until i turn 18 and then I will be the one under the contract...neither of us has rlly ever cooked anything..so how do we learn how to cook. Umm also how much are groceries....my mom pays 100.00 for 4 ppl n it will be only me n her n my lil brother will be over by our house half the time...um how much should we exspect to pay for furnature(we have our bed room stuff already :P )um we also have 2 desk n 3 laptops...n 2 TV's n 1 entertainment center um and we plan on mostly getting our stuff off of craigs list(we will only get it if we meet in person...scared of other craigslist killers :P ) ummm plz do not say we r to young. My little brother said he would mow our lawn(yes the trailer has a yard)...um plz any thing you can think to tell me plz tell me becuase we wanna be prepared...oh she is n college n im n GED classes...we both have out license n a job.