How do I make my computer better for gaming?

You need a better video card for the most part; you can't really play games with the video chip you have and that means new power supply possibly to support the new video card. Also RAM 1 GB is very little should upgrade to around 4 GB or more. My suggestion is to just buy a new computer it's too much to upgrade your pc and you're upgrading most components anyway might as well just get a new PC.