Just a comparison; In model railroading these days almost all good to top end sells on a pre-order basis. If you are in the market for a particular locomotive or rolling stock, if you don't pre-order you are most likely to miss out. They do runs of a limited number, and it may never be run again. I've seen buildings recently offered this way as well. They have succeeded at this and prices are (I think) ridiculously high. Most railroad modelers average age is over 60, returning to the hobby after a childhood fascination. Kids grown & gone, retired or about to, and have money to spend.
As for this hobby, the market is flooded with what we want (with a few exceptions) and it's almost a cut throat price battle with everyone selling on Ebay these days. Since they are stuck at home anyways...
If you can't be contacted to resolve issues or questions 24/7, buyers will just move on.
(pause, Piano Man by Billy Joel on radio)
LPR is most available and the items and availability as you go higher on the ladder of HPR get more limited, and expensive.
Some people don't have time to shop around, they need something, they need it NOW, and they will are willing to a little more if they know it will be on their door step 2 days later.
Some people (like me) have nothing but time. I'll spend 2 hours searching for something I want to get the best price. But, I'll be waiting a week to get it, but I don't care. For what I do, I pretty much know where to go to get the best service, fastest delivery and the best price. Personally, I hate talking on the phone anymore, and hate texting even more. But when I send an Email, I don't want to wait days for a reply. If it's about a purchase, most likely I've moved on by in a couple hours.
I'm mostly interested in OOP Custom, Quest & Estes Kits, but also buy new ones. I also scratch build A LOT. Right now Balsa is a PITA to find, or good quality when you find it. So I'm looking at kits mostly right now.
I personally have a wide range hobby knowledge as I do leather crafting, been looking heavily into model railroading and I still try to do a little wood working occasionally. But lets stick to rockets as that is your interest for a business.
What can you offer ME that would bring me to your website? To check out what you have, and make a purchase?
If you are asking us what you can do for us...you had an idea and didn't do much, if any, research into the idea.
If you can answer my question and bring me to your website, then you have a chance at success.
Selling rocketry IS NOT a get rich quick business. It takes a fortune to get started, no mater what you plan to sell.
Most vendors are created out of passion for the hobby and the people who also enjoy it. There is profit, but it's not big and it doesn't come fast. And those that succeed take a unique pride in servicing their clientele, whom ever it may be.