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.

If you still did not manage, your next step would be to use the forum search (of the right forum, in this case Developers), since it is likely that your problem has been discussed before already and there are various replies.

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