How to make a server?

I have actually managed to get one to work on my old Inspiron 1020 but yeah the slower your internet or computer or both is the worse off you will be I would suggest you purchase a VPS from many different websites and install the garrys mod server to there and run it from that if you need help setting up a VPS I am more than happy to help you if you add me on discord nartuosage#0007