If you really want to make a significant amount of profit that makes it worth your time, you need to be able to get a good amount of pairs. Picking up one or two pairs of yeezys might sell for a lot, but if you wanna consistenly make money, picking up small amounts like that isn't really gonna do too much. You're better off picking up a large amount of shoes that are less profitable but are easier to get rid of. Although selling big ticket shoes like Yeezys have a high profit margin, it's pretty tough to find legit buyers that are willing to spend a large quantity of money on one pair of shoes. It's quicker to buy a bunch Jordans that are in relatively high demand and sell those off for a smaller profit margin. This is just a general example but you get what I mean.

Living in New York I've come to realize that being a legit reseller just comes down to who you know. You gotta have plugs, you gotta know the other resellers, and you really have to network to be able to get the amount of hyped shoes you need to make a profit. Also another thing most people don't think about is knowing the right people to sell to. A lot of the bigger resellers in NY have customers that will buy a large amount of pairs in bulk which makes it easier for them to simply pick up a lot of pairs and dump them off quickly without having to hold on to product.

There are a ton of other things to take into account such as selling on ebay and things like that, but becoming a reseller with the intention of making a consistent income is a lot tougher than most people think. Not sure what you had in mind, but if you didn't really make it clear whether or not you were interested in just reselling a pair every now and then or resell to make a significant amount of money.