Want to mine

Building a mining rig isn't the best thing to do if you're just starting out. You need tons of research, not just from one place. Do a lot of research for yourself, pick a currency you like and see whether you need to get AMD or Nvidia.
There's no use in CPU mining, unless you're using a Threadripper -- IN that case, there's tons of things you should rather be doing other than mining.
Buying an ASIC is far too dangerous because of the instability of the market -- though with great risk comes great reward!