The best thing to do is to read the Help Center, and specifically, in your case, where your questions are not off-topic, but not that well received:
That said, Meta is not meant to check if a question is OK before asking it, usually. The guidelines are pretty clear, and generally downvotes are used by members to indicate it is not a very good question, i.e.: it's not off-topic, but it could be improved. Meta can be used to ask about a specific type of question, if it's unclear per the guidelines whether it would be on-topic. The on-topic tag is used for those.
Rather, Meta is intended to discuss how the site works and the various minutiae that comes into play, including specific posts. If you feel that a post you made was mishandled, then ask on Meta and use the specific-question or specific-answer accordingly.
If you are truly unsure, feel welcome to drop by The 2nd Monitor chat room and ask about it. Just put your post in a PasteBin or Gist and we can have a look. This is generally not needed, but it is an option for you to get feedback ahead of time.
As far as drafts go, Stack Exchange does save an unpublished copy of your post, should you navigate away from the page, but other than that, there is not a system to manage draft versions of your posts. If you wish to request such a feature, you should post on Meta Stack Exchange with the feature-request tag.
