Where do i start?

ok… i want to create a game similar to one at orisinal.

the game name is High Delivery. link: Orisinal High Delivery Game

i’m quite proficient in programming and AS, so i can safely say i understand huge chunks of code… but I need to know how and where do i start doing a game like this?

i kinda need to do this for a competition which is going to due soon so i dun think i have the time to go through all the fundamentals tutorials.

i hope u guys can help me in this one

thanks a lot!!