How can I make a game?

[TicTackLock]

Me and my friend (name withheld) planned on making a video game of our very own...but we both are inexperienced. I have MMF2 and we wanted to make a megaman x style type of game. We already have most of the characters thought out and ready to sprite in graphics gale. The only thing to do is figure out how to code or manufacturer the game together, and I am asking if anyone knows how.