roughbeak :
Hey,
A good question you have there. A decent graphics card (GPU) and a processor (CPU) are both required to have some nice gaming experience. Perhaps you can list the hardware parts you currently have, so we can tackle this problem in depth.
To answer your latter question, the two below links are some good looks at what are the best cost efficient GPUs & CPUs.
http://cpu.userbenchmark.com/Explore/Value-for-money/16
http://gpu.userbenchmark.com/Explore/Best-Value/20
Hope that helps!
Regards
Thank You, here's my specs.
CPU
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Model : Intel(R) Pentium(R) CPU J3710 @ 1.60GHz
Logical cores : 4
CPUID : GenuineIntel family 6, model 4C, stepping 4
Tjmax : 90°C
GPU1
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Display device : Intel(R) HD Graphics
GUID : VEN_8086&DEV_22B1&SUBSYS_09531025&REV_35&BUS_0&DEV_2&FN_0