There are many ways of getting a LN address, the easiest is to get someone to host it for you. To do that, you can use e.g. LightningTipBot which is a Telegram bot. Or you can use something like Alby, StackerNews or Wallet Of Satoshi.

If you’re a technical person and like to self host stuff, you can check out BTCPayServer.

You can read more about it here: https://lightningaddress.com/