I thought the other thread you started was quite informative in terms of the answers you were getting.
if I remember rightly your looking at
dtg because of the number of colours and the small amounts you want but you'll need to find someone with a machine that will do big enough prints as the designs looked quite large, was that the gyst of it?
I don't know anything about
dtg so can't help you I'm afraid.
If your ultimate goal is to have a thriving online store or retail space in your town or be a designer (3 totally different things IMO) then the first thing I would do is get yourself a well written business plan.
This will help you focus your goals and also realise what compromises you may have to make to get the idea off the ground depending on how much capital you have to invest and which route you want to go down.
