[BlueDevil89]

Four words...KEEP YOUR DAY JOB!

Keep working to support yourself financially. If you plan on supporting yourself as a baseball card dealer, you'll need an inventory 10X your annual income expectations. Do you have that level of inventory or the cash to purchase that level of inventory? If not, don't bother. If you do have that kind of inventory / cash, go for it, and good luck to you!

A brick & mortar shop will sink you with rent. An online website will face fierce competition. Unless you've got the juice to be another 707, don't even think about it.

Keep working and use the money you save to buy baseball cards and build a bigger collection / inventory. Be a weekend online dealer through your eBay profile. Then, when you've made it to retirement, you'll have a fun hobby to keep you busy while adding a bit to your retirement income.

Don't bankrupt yourself thinking you can be a full-time sports cards dealer. The failure rate is 99%. Many people hate their jobs --- that's why they call it "work" instead of "happy fun time". You show up every day to pay your bills and support your habits (such as collecting old pieces of cardboard). Everyone wants to figure a way out of the grind, but being a baseball card middleman won't get you there. The market has too many sellers and not enough retail buyers.

Oh, and as your collection gets large enough, buy insurance for it.

Sorry to throw a wet blanket on your dream, but I'd hate to see someone lose everything on an unrealistic business plan. Figure out a way to be happy at your job, or get a new one...and keep spending that disposable income on vintage baseball cards.