We understand that you want to do a full checklist before you proceed to do a campaign launch.
Here are some of the checkers to test if they are set up correctly.
For domains, you may use SPF and DKIM check.
For email deliverability, try our inbox placement feature.
For leads, please follow the steps here.
For campaign schedule, you may check this article.
For campaign options, you may check here.
If something is wrong, you may use this guide to fix it.