How to buy ethereum safe

I know this question has been probably asked a thousand times and you can google it but I really need some experts opinion fast. I wanna buy an NFT to enter a Fanclub for a Band (I know it's weird but it's my favorite band since a long time). The NFT costs 0.07 ETH. I don't want to keep the ETH longer than necessary, I just want to buy the ETH and then immediately buy the NFT with it. Which Wallet should I use, how do I set the whole thing up… It would be really nice if somebody could explain the whole thing to me, because I tried to search it online but I just don't really understand it and the NFT leaves the market in 5 Days! Help would really be appreciated!