OK, I had to look up DIY..I'm not an acronym person.
You need to tell us more about what system you have and what you want to do with your computer - what tasks you expect to do. This is a huge assumption on anybody's part to guess these things and make accurate suggestions. Depending on your hardware and what you plan to do with your computer, more pertinent suggestions can be made.
First, you may want to read
this article if you have no knowledge of Linux at all.
Once we know what system you have, then many recommendations can be made.
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"I love it when a plan comes together." - Hannibal Smith