Once you have a channel, you can receive sats through it - a channel isn't just for funds, but also for routing payments, like your uplink to the internet. So if you were to open said channel, you could receive a maximum of 1k sats before you had to either increase it, close it and make a new one, or spend some. That said - this is getting more into the weeds than I am really aware of...
For most of what I read, I used https://docs.lightning.engineering/the-lightning-network/payment-channels
Hopefuly it helps :)