Amazon FBA <- they will handle distribution, sales.., shipping and warehouse.
One or two ppl can run a huge business out of a home office or garage. It is not as good as when it first started, but it is possible and repeatable to function like a 1000 person company. Amazon takes a cut that is more than it used to be, but at the scale that a person can do the money is insane. Literally, you can sell thousands of an item or items overnight... the secret is sourcing. Look for products that are pulled from general sales in stores, figure out the problem they had, buy it (ALL) and go. Find the distribution warehouse of the same. Can get things at lower than cost. I guarantee it works. you can rent trucks or use freight until your ready to buy equipment. when you find something.. buy it that day on the spot.
At a smaller scale for starting out; do the same; when Costco dumps something below cost buy the pallet or pallets of it and from all the locations you can reach. Push it through FBA. Others are already doing it because it works, anyone can do this. um... careful of candy and chocolate in the summer.