it takes a long time to say things succinctly! and things have changed significantly a few times over the last year as i tested designs. unfortunately 300 sats is too little to run a node, as each quorum rotation (currently every ~ two weeks) requires an on-chain transaction of 180 vbytes, which at 2.5 sats/vbyte is 500 sats every two weeks. depending on a node's advertised fees you can store just a few sats in a wallet. my first few nodes have high per-deposit fees (208 sats / month) and low limits (1,000 sats max) so that people don't keep funds there yet. but if you have custodial lightning or ecash, you can still make wallets, move funds into them, between them, back out of them, etc. fees are only taken when the balance is greater than zero, so moving funds through them quickly only costs lightning fees. it's all pretty loosey goosey until more people start running nodes and a market emerges