10400 + 580 or just stick to 10400 igpu ? also suggest a budget mobo With wifi else non wifi fine!

so i want to build a pc for my family member he is 70 years age and only knows mac
10400 proc bought
580 i have spare
shall i get which mobo so it gets good sup >? also shall i get 580 or keep igpu use as he will just do browsing 0 gaming