Definitely a good idea to be thinking about this right now, in this low fee environment.

If I were you, I’d skip the first tier. That sounds a little too small to be viable in the future, if fees were to spike on chain.

0.005 at a minimum. But if I were in your shoes I’d aim for 0.01, 0.025, 0.05, 0.1.

Try and keep them separated by source, even if you’re coinjoining to get there. Sounds like you know what you’re doing otherwise, but try not combine more than 2 UTXOs in any given coinjoin.

Shout if you have any other specific questions for the plebs to answer.