A:AnswerAccess to email will be the same as you do now, either through an email client (such as Outlook) or browser, although you can always change it. Zoom will access your camera when you first use it by asking permission: once you grant it, you won't have to do so again on that computer, unless you have a major problem (computer failure, OS reinstall, etc.).
A:AnswerYes, but only to a limited extent. The Thunderbolt cable will not magically give you capabilities that are not already there, so you will be able to add external drives and possibly additional screens, but you won't suddenly be able to power the laptop via USB ports.