A good way to choose your parts is on pcpartpicker. If you feel like searching and just looking around, select a category and get to work. Otherwise, try the Build section and then select each parts. The bonus about this is that it lets you know if there are any compatibility issues and what the estimated wattage is.
Wattage is really important because if you have a under power PSU (Power Supply Unit), you can damage parts and then probably have to replace them. So I would always go a bit over the estimate because 1) its an ESTIMATE, not exact. 2) You would always have room for a little upgrade if you wanted.
Hope this helps!