It takes time to learn, if your pretty good at gaming then you'll be an average cs go player in 4 months.
Keep doing it for a year and your subs will go up, that means don't stop uploading. Try to upload 3 times a week.
It's the best competitive fps there is but there are better non-competitive fps games out there.
You just open cases if you have money for it, if you want a good skin buy it.