I am 17 years old and just got charged with a 221.05 (Possesion of Marihuana) and need advice please?

Ok well i don't wanna go into to much detail other than i just got a car a few days ago and if my mom finds out she WILL take it away, and i don't want that. so it happened tonight, and they took me down to the station in cuffs and gave me a ticket to appear in court. I have a few questions. 1, will they send letters home that my parents will see and if so when should they get here, 2, how much will the fine/court costs/everything end up costing, 3, do i just go into court and hand them cash, 4, since this is only a violation is this gonna come back and bite me in the *** when i'm trying to get loans to get into college, and 5 should i tell my mom? any answers will be greatly appreciated, i just want to keep my car.thank you