So, essentially, you want to do what everyone else on this forum, MTBR, and many blogs have already done.
Please feel free to ask as many questions as you like about your build, however, what you are proposing is nothing new. This forum exists for individuals who have a budget, want help with component selection, need advice, or have problems they need answers to. Look forward to seeing your build, just post any questions and I'm sure you will get them answered quickly.
Your first decision will be hardtail or full suspension. Looking at your budget, you can build either.