I have to agree with the guys above. Maybe you need to start on Etsy or Ebay. At times random people have found my website and I've shipped cornhole board covers all over the US but it's a pain if you're not set up for it. A few years ago I had an account on Etsy to make those wood
signs that were all the rave. I got my account taken down because I didn't ship a couple items out on time. You must keep in mind when you do this people expect you to ship out that day or the next day. You must have this shipping thing down to a science to do it on a larger level. It's surprising to me that you don't already have at least a USPS account. I prefer to use them because I don't have any UPS/Fed Ex pick-up areas in my town.
Do as stated above, go on Amazon or Sticker Mule - whatever. Spend $100 on a multiple different sticker items from different vendors and see what the process is. People want tracking numbers, etc. so you need the entire system set-up behind the scenes just to send out a few stickers. It's more involved than you think until you have a system down.
If I remember correctly, which I know I do, but I won't say his name - there is also a high rate of returns that never get returned, "lost packages" etc. I think it was up to 20%. Keep that in mind as well.