Okay...
If I understand correctly your CURRENT system is something like THIS:
- G4400 (CPU)
- 1151 motherboard
- 4GB DDR3 memory
- Windows 64-bit 7/8 or 10?
And your MAIN ISSUE is what to do with your current funds?
Well if you can't afford a GRAPHICS CARD and a CPU then it's better to get just the graphics card. No point in having a good CPU without a graphics card right?
So you'll have some CPU bottlenecking which varies significantly from game to game (so maybe do a little research on how demanding some games are for CPU... some online games like MMO shooters can be really demanding).
At this point I'd point you to pcpartpicker, and
1) look at new graphics card, and
2) add more system memory (4GB isn't quite enough)
Not sure what system memory you have. You can MIX in theory, but if you have a single, 4GB stick I recommend an identical or at least the same frequency and CAS (i.e. 2666MHz CL16) then worry about getting it working properly if you have issues.
I'll post this and see what PCPARTPICKER has trying to get both for under $300CDN (Canadian).