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Does this mean there is no way to mine steem now? Or just that these instructions won't work?

There's no way to PoW mine now, it's all PoS witnessing

How do I pos witness? I'm still fairly new just so you know! :)

I have to correct myself, PoDS - Proof of Delegated Stake. That means your "rank" in the witness list is dependent on witness votes from other users. These votes are stake weighted, and stake here is Steem Power. You can find more about these concepts in the FAQs and various links on steemit.com help area.

Here's two good witness guides that will get you most of the way

steemit.com/witness-category/@krnel/complete-witness-installation-guide

steemit.com/witness-category/@klye/the-complete-noob-guide-to-steem-witness-setup

You should also join steemit.chat channel #witness and seek advice there.

In terms of server hosting, @someguy123 apparently has a service specifically aimed at witnesses that several use, check out his post on Privex. @l0k1 always says don't use your private keys on a server which you don't control - I agree. Be careful with them.

Good luck!

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