There are a few personal questions there for Laurie, so I will leave those for him to repsond to. But there are a couple that I can help you with, so I'll take care of those for you.
1. eBay selling limits. New accounts can be limited by eBay and it's important to highlight that by new account, I mean all new accounts. So if you have another successful account you have been using and open another, then you can find that new one limited. I know, that seems a little stupid, but that is as it has been and I'm not aware of nay new changes in that area.
Now the good news is that these limits are only for a limited time, esentially until your account has been proven and then those selling limits can be lifted.
2. Dropshipping on eBay. Dropshipping is not only allowed on eBay, I would take a guess and say that it makes up an extremely large portion of their revenue base. The thing to watch out for with starting a new dropshipping account is a PayPal funds hold. PayPal can hold funds paid by a customer until they receive confirmation that the transaction/s has been completed.
This can usually be done by providing PayPal with an item tracking nunber or the buyer confirm that they have received the item. So a lot of people come unstuck with this hold due to thinking they will be able to use the customer's payment to process their payment for the item. So that is something you DEFINITLEY need to be aware of when dropshipping.
To be honest, since eBay and PayPal have now split, I'm not even sure if PayPal still has this hold policy in place. I would suggest perhaps confirming that with PayPal just to be sure.