An Arweave wallet is your passport to the permaweb. You can get one via a few different methods: ranging from browser-based wallets (MetaMask-ish, but for the permaweb), to locally stored methods.
Wander
Visit Wander and get set up with an Arweave browser wallet extension (for Chromium & Firefox) that can create a wallet for you & keep your keys secure.
Arweave.app
ArDrive CLI
The ArDrive CLI can generate a seedphrase and wallet on your machine. To get started, head to the ArDrive Docs Portal for full instructions and a set up guide.