If you intend to create a game, the first step should be to start here, since this is going to provide you with material to learn the basics of programming (in BYOND).
Try to have a look at the DM guide (and reference), since these will enlighten you past any tutorial you're working on. But don't 'rush through'(browse), like with a comic.
Sometimes you will think that you already know something, when you do not yet know all of the interface it comes with.

Whenever you are struggling, a developer should use the Developer forum to seek assistance from like-minded community members.