You should think about getting a synthesizer then. You can emulate a lot of instruments with it and produce an entire song. I would suggest you try using Vegas instead of Pro Tools if you're currently working on using Acid Pro. It's much easier. Acid Pro is great for loops. Pro Tools is wonderful for post production work, i.e, creating sound effects for video. Logic Pro is great for music production work though it's a tad more difficult to work with, especially if you're not into reading up on the software.

I'd teach you to use Acid Pro but I don't have the time right now. Try to search for tutorials on the web. Google's a good place to start.

Good luck!