Limit Rule

I have a number of questions from you, neither of which did not come to end:
1: It ‘s possible to limit the creation of the post from the authors? I would give the opportunity to create a number of posts depending on the time the user level?

2: I also use to create the post in front-end and

3: I would also like to filter the display of articles by the author, or they must show only the items that have created the single-user

Thanks