Acting,,how long will it take...

I do theatre and drama,,,but how long roughly would it take to get in to movies and adds and stuff,,,(im not too crap at acting))

Depends on where you live, how proactive you are in pursuing your goal. Could take many years, could take one audition. Also, it takes a lot of support from your parents.
you need a talent agency, a manager (or like myself, I am my daughters manager at the moment---or we say, I'm her **momager**, lol). They'll find the casting agents and what they're casting for, what theyre looking for for the character, etc and they send you to the audition if your right for the part.
Its a lot of work, a lot of time, and sometimes... a lot of luck!
Good luck! (=