@dostovel 2.8 has this experimental thing where you can use both your CPU and GPU to render, and in most cases, it’s faster than either alone. Here’s an article.
You could render with Eevee for time’s sake, but be aware Eevee is suppose to act like a game engine, so you may get less accuracy. There are also a lot of switches to flip on that are on by default in Cycles to get something comparable.
It sounds like you need to set some money aside for a better PC. Set some aside, no matter how little. If you get a bonus, file that away towards better tools. This is your livelihood. Invest in it.
The best thing to do is plunge right in, Omar. Start fiddling and see if it’ll work for you or not. You never know until you try.