Best practice customizing scoping activities

Good day SAP community,

I'm new at C4C asking for the best practice in customizing the solution .. with ERP we make copies of standard values starting with Z and making changes as required in almost everything, but in C4C I see that in some scope activities the admin guide suggest change on standard values and also have the option 'Restore standard values' or delete them. With your experiences what is the best practice? Adapt standard one an create Z only if needed more option, create always a Z copy of the standard values, or a mix of this two options depending of BO? I also wonder ¿how many days advance should I ask SAP for the productive tenant before the going life date?

I apologyse for this silly questions, but the manuals doesn´t mention it and the Q&A of the community have been a great support on my learning journey in C4C.