With questions like this - the help and the tour are your starting points.
I don't have a question but actually some kind of advice for hopefully a number of superusers around there?
Er... depends. Can you frame it as a question? Is it a solution for a real problem with a real solution?
Should I first ask the question, wait a bit and than answer my own question?
Self answering is fine - you can even tick a little check mark to self answer immediately if you want.
Make two accounts one for asking one for answering? (probably a bad idea).
In this case, not a good idea. Some folk do have alternate accounts and you can find the official rules on that here
These aren't boards, these are Q&A sites, and we do work a bit differently. Does look like you roughly get that though.
