I’m just getting into Ethereum and some help

I'm planning to get into NFTs and trading, but I don't know the right wallet to use. I don't plan to buy ethereum with money but instead trade to earn ethereum. Opensea is the main marketplace I plan to use, and Trust and WalletConnect is the main i've looked into.But lots of wallets i've looked into have a sign up fee and/or interest and as a early investor, I don't know if i'm willing to make that commitment. Any help would be great and I'm really excited to get into ethereum.