If you have no money, you might just install virtualbox and put a Linux node on it to download bitcoin core (details for installing this free software are in Antonopoulos' book "Mastering Bitcoin"). But this will not be fast enough to actually mine bitcoin (well it will dig but unlikely to win any blocks at the current difficulty level)--you could have a full node for fun though.
If you are more serious, you might start by buying an Antminer--here's a youtube video by a funny person hooking one up: https://www.youtube.com/watch?v=sz-XZL77qqs (it's an Antminer S9 from 2017). Once you do this you'll have an idea how power, heat, and space will impact your farm. And you could join a pool to get some reward at least:)