Issuing certificates Step 2

Hello and Happy New Year,

I follow the instructions from this link : https://github.com/blockchain-certificates/cert-issuer and I would like to ask about step 2 at Issuing certificates ,is it essential?

Should I have my own wallet to continue?What does it mean “Make sure you have enough BTC in your issuing address”?

What will I need to run bitcoin-cli generate 101?

Thank you in advance,
ktsak