Sharde Harvey, DDS

Have you tried booking an appointment with a dentist? I'm sure they will be able to help you. 
A full exam needs to be done and perhaps braces or veneers depending on what the xrays look like. 
Regular visits every 6 months to the dentist are a must to ensure good oral health. 

More information is neccessary to estimate the time, what does the posterior teeth look like? 
What do Xrays of the full mouth look like? 
Many other factors will determine time it takes to accomplish your goals.

No, invisalign closes spaces but not 5 missing teeth. You need a consultation with a dentist for a proper comprehensive exam and work up. But regular visits to a dentist will help you to understand your needs better. 
Schedule a visit with a dentist as a first initial step who will then guide you to accomplish your dental needs. 

You cannot make an assessment with a panoramic. You have to Trust your dentist. Implants have to be placed where there is bone. Sometimes they are placed at angles and the posts correct these angles. Internal sinus lifts are done in the premolar area routinely. 
If you are not having any issues why worry and ask others opinions. You should Trust and ask your dentist these questions. 

First get the invisalign cleared by your tmj doctor. If you have had braces before then invisalign should be able to move your teeth but get a scan, have someone check out your joints First and make sure none of the teeth are ankylosed and you should get a nice result! Good luck!!