There are some incompatibilities with the parts you listed.
Ryzen processors use DDR4 RAM.
A GT 710 is a discrete GPU and would work with a Ryzen CPU as long as you have a motherboard with an appropriate PCIe slot. The GT 710 is a slow and old GPU and can easily be outperformed by the integrated graphics on a Ryzen APU (Ryzen 3 2200G).
Will Asus Nvidia geforce GT 710 2gb 64 bit Graphics card andCorsair 4gb DDR3 ram Fit in amd ryzen 3 1200 processor?
lol Well you dont put a graphics card, nor ram INTO a processor but if you mean will they work on a motherboard that supports that processor (AM4 Port) then yes but youd need DDR4 ram. Ryzen are APUs and ud want a higher speed as well and I would recommend 2 4gb ram chips. But if you can only afford 4gb then get a pair 2x2gb chips to run in dual channel.