Guide for beginers?

Is there any COMPLETE guide step by step about how to set up a complete rig for mining Filecoins?
What is the minimum number of Terabytes to get rewards?

Welcome @Alfalf

I suggest starting here and joining the group on Slack and GitHub

You need at least 10TiB of sealed sectors to be eligible to earn block rewards, the more ‘power’ you have the higher the chance of getting a block reward.