Hi there.
You should check out this information.
If you want to use a WI-FI router, you should use the best 2016 routers available (for cheap) to do the job.
Top: Wi-Fi Routers for Fiber Optics - Optimize your 2016 FTTH network
You may want to use CAT6 or 6A for wiring to your desktop, you dont want to create a bottle neck in there either if your FTTH connection is fast.
Hope this helps!