You can find uToken collections on the Discover. If you find NFTs that you like, look through the collection and put up a bid! If you want a piece of the whole collection, you can buy some uTokens.
As a uToken holder, you can govern the collection. If you believe that the total value of the bids on the collection is high enough for the collection, you should stake your uTokens to unlock the NFTs. Once enough people stake, you can redeem your uTokens for some of the NFT auction proceeds.