I would like to build a pc with :
ASUS-H81M-PLUS motherboard
I7-4790 processor

but i have no idea about other parts
please somebody?
and also the case is mini

Do you already own the mentioned parts?
What is your budget?
What are you going to use the PC for?

yes i already own the mentioned parts, i would like use this pc for games, budget hmm 1000 euro for the rest parts

Budget:
More specific use (what games, what programs):
Planned time until purchase:
Do you need an Operating System?:
Do you have any specific preferred components?:
Do you need a sound or wireless card?:
Do you want stock cooling or do you plan on overclocking?:
Do you need a monitor? mouse? keyboard?:
Zip code/location? (Shipping costs):
+ What case do u exactly have?:

I need to know the case for gpu and psu size

Ram: 2x 8gb ddr3 1600mhz (mobo don't support higher frequency) - 110€
Ssd: 850evo or Mx300 250-275gb - 90-100€
Hdd: multiple options 1tb - 50€
Gpu: rx480 or gtx1070 (depends on your monitor resolution and games played) 250-410€
Psu: evga g2, g3 or gs 550-750w - 80-90€

Optional a cpu cooler like cryorig h7 35€