T-shirts Mockup selling website

First priority is using the mark (which should have a TM prior to official registration) on t-shirts. Color separations for the logo will be necessary. It will be limited to two or possibly three colors. See below for answers in red. What is the purpose of the website only selling t-shirts, lighters, coffee mugs, etc? Short story, maybe a video, explaining how the phrase came to be. We can ‘mock-up’ items and take orders for all but the t-shirts, which will be available very soon. What payment gateway would you like to use Stripe-PayPal-Skrill? I don’t know which is the most popular and/or easiest to use. How many items would you like to add to a started store? T-shirts first. Let’s begin with three other items. those products manage yourself or we do for you? Since we don’t know how the phrase will be accepted and the volume—if any—we’ll ship, this is difficult to determine. How will you source and deliver those products? I’m looking at options. Suggestions? Don't apply if you not able to do this task.