That's VERY easy Laverne - just don't push any buttons to send e-mail to people.
Nothing in easy-Speak is sent out to members unless there is a deliberate choice and human action to send it.
Once you are running normally I'd expect you would send mail to members to advise them of role assignment and ask for confirmation etc but that's your choice for when to do it (or not do it).
Mentors may be advised by e-mail when their mentee requests a speaking opportunity - but that only happens if the member themself requests the speaking slot (i.e. not when the VPE books it for them) and only if the club options specify it.
New members and Visitors that are added in the normal process (because they attended a meeting or signed up) will be sent a welcoming e-mail with their username and password. - but you won't do that yet until you have it all working and it's routine to add your Visitors as part of the follow-up.
You will be adding all your members by spreadsheet import - which sends nothing to the members and sets you up to make a small training session where you hand out the usernames and passwords and tell them how to log in.