I think ebay would be a good start to get some things sold. There are people on there who have 10's of thousands of stickers sold. Little 7" ones at 5-6 dollors a pop. Sell 5-10 a day at $5 thats $25-50 day X 7 days = 175-250 a week around 700-1000 a month, just throwing random figures out there. Maybe im dreaming?
You need to learn the difference between GROSS SALES & NET PROFIT.
$25-50/day!? Why bother with that!
Design/layout, Cut, Weed, Mask, Pack/Ship, Postage, Gotta buy stamps/envelopes, answer emails from buyers, post new auctions every day, deal with paypal, shipping/delivery on vinyl/mask, cutter costs amortized over time, knives, picks, blades, squeegees, work table, auction fees, paypal fees, ...
oy vey!
Just go get a PT job at McDonalds and be done with it! Plus you get free french fries!
If you DO proceed... set your sites MUCH higher than $50/day. Aim for $5K/day! There's people making that doing what we do (and some alot more than that!). Find out who they are and start doing what they do. Don't copy the $25/day folks!