I see that you don't even know that Filecoin mainnet will start this year, maybe even in September.
Everyone is welcomed to take part in "calibration" testnet right now, since the "Space race", an incentivised testnet phase, will be started in August. Hurry up to get all HW components together and configure and test everything!
Minimal HW requirements (from my own practice) are:
1) Modern AMD CPU with SHA extensions support (Ryzen 7 and above). Core clock matters, not core quantity.
2) 128 GB RAM and more.
3) 1TB NVME (better 2TB) for sealing process and swap.
4) Any TB on HDD dedicated for storing sealed sectors (I will use Raidz array of 13x10TB HDDs).
5) 1080Ti GPU (better 2080Ti since it will give you more computing power).
A good place to start is
https://filecoinproject.slack.com/See also
https://filecoin.io/