PC upgrade help

You can get an SSD of just about any size and plug it in with a sata cable, you probably have, at least, three ports on the motherboard.

The only things that you should have to worry about when replacing a video card are if the new card fits in the case and power draw. The new cards are thirsty.

Use "start a new build" on this site and enter your parts. It'll show compatibility so that you don't buy the wrong thing and it tells you how much power what you have might draw. Changing the power supply isn't difficult, but it's an added expense for some upgrades.

https://pcpartpicker.com/