One of the most popular ones is https://metamask.io/
Go to https://ethereum.org/get-eth/ and click "Search by country". Choose your country and you'll get a list of possible ways to buy ETH.
Also create an account on https://opensea.io/ - that's the place where all NFTs will be posted and showcased.
When the mint date starts, you'll be able to mint the NFT on this page. Make sure you joined the whitelist!