The short answers to your questions are simply that you really need to seek professional guidance and, most likely, need professional income tax preparation.
TurboTax does not support the MTM election in any online version. Even with the desktop versions, you are essentially stuck preparing a statement in Forms Mode and then printing and mailing your entire return.
With respect to Form 3115, that is not typically a DIY project; again you should seek professional guidance. However, the form is included with TurboTax but must be prepared entirely in Forms Mode (further, in some instances, Form 3115 must be filed in duplicate, one copy is filed with the return and a copy is mailed to another IRS office).
