Hi Chantal and welcome to the forum,
Don't worry about being overwhelmed, it's a lot to take in when you're just starting out in online sales, but that's why were here. Any questions at all, just give us a shout out and well get you some advice.
A few points to cover for you, but I think it's best we start by clearly defining the difference between Wholesale and Dropshipping as you seem to be using both terms as a single entity, which they aren't. You can read about the different supply methods on the thread below to get a much better understanding. .Link hidden: Login to view
In relation to your questions. Most suppliers will provide you with product images, however just check with your actual supplier to confirm what they provide for you to be 100% sure.
When you're ready to start selling you have to open an account with the supplier/suppliers of your choice. You can find those that Dropship specifically in our directory by using the search interface to narrow your results down to just Dropshippers only.