Can I have more than one user? Is there a limit?
They'll have decent questions I think, but may stay dormant for a while...
It is allowed to have several accounts as long as you do nothing with those accounts that in essence you could not also do with a single one.
Some examples of things not to do:
Do not use a new account to evade a suspension or ban.
Do not vote for posts of your other accounts. Best, try not interact with posts of your other accounts at all.
Do not use another account for some action once you hit a rate-limit on the main account for this action (especially voting).
Do not use several accounts to vote multiple times on the same post. (This can be tricky to track; a solution is to vote only with one account.)
However it seems your intent is to use them just to ask questions. This should be mostly fine. (Except of course if you should use them to get around a question ban or rate limit, or other shady actions, like asking anew with another account a minor variant of a question of yours that got closed earlier.)