@AOOP9_2 1) Your "2)" answers your "1)".
2) For streaming, that processor and graphics card are not enough. You need a quad core processor like that i5-4670 or AMD equivalent or better (better= faster core speed and/or more cores). You don't have a separate graphics card, your graphics card is the one you got together with your processor, and it's a weak one for streaming.
3) 4GB of RAM will not be enough for streaming. The reason is next: your stream could potentially be slower than usual (not smooth in other words) compared to 8GB. Everything you do on your PC (playing chess, listening to music...) is stored on your hard drive (HDD). However, your PC will transfer your actions to RAM memory so your PC would still stay in good condition regarding speed, even when doing multiple things at once (multitasking). With 8GB of RAM, your stream (if you intend to stream strictly chess) will be smooth, 60 FPS.
What PC I recommend for streaming chess:
Processor: AMD Ryzen 3 2200G
Motherboard: A320M
Graphics card: GTX 1050
RAM: 8GB 1600MHz (probably minimum, if you can afford one with more MHz, definitely do so, Ryzen processors need RAM speed)
HDD: 500GB
Power supply: 500W
Case: Whichever one you like, bigger ones are safer (you don't have to worry if your PC components will fit)