DNS Delegation with Netlify DNS & Domain.com registrar

Solution 1:

1. Yes. You are configuring your brand new authoritative nameservers for your zone (NS registers) and they are going to be in Nelify and they are going to substitute the nameservers that Domain.com facilitates by default.
2. Ditto
3. As you know, DNS maps names to IP address. You should add any name that is going to be used to address your app. Normally @ or something.press. to use your domain without prefix (please note the trailing dot of the name), www (please note the absence of trailing dot) as an A, AAAA or CNAME record (if your fixed IP address are "yours", A or AAAA), If you are going to install mail servers, you should configure MX records and TXT records for SPF and DKIM, etc.