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][1] - 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][2]

These aren't boards, these are Q&A sites, and we do work a bit differently. Does look like you *roughly* get that though. 
  [1]: https://stackoverflow.blog/2011/07/01/its-ok-to-ask-and-answer-your-own-questions/
  [2]: https://meta.stackexchange.com/questions/57682/how-should-sockpuppets-be-handled-on-stack-exchange/57685#57685