Lol I seem to have the same problem. I've been asking all sorts of questions here for centurys. Im not giving up though since I am.... making.... very.... slow.... progress.
My advice to you is to do lots of searches on the internet for free DarkBasic sources. They've helped me a lot.
Here's a very good link for you:
http://www.colorarts.de/dbtutor
I have just learned so much stuff from this program, and still look around in it. Lot's of free sources, just change and alter stuff in them, you'll see what different commands do.
www.mirrorman.cjb.net, the classic Commodore 64 and Amiga site.