No. When you send a paper for peer review you must wait for the result. Once it is accepted and the peer review process is over, you can send another manuscript.

No. This is against the codes of COPE. If one does so, his/her article will not be published. In case it is already published, the article will be retracted. Then the name of the author(s) will enter our blacklist and no manuscript will be ever accepted from the author(s).

No. Only the corresponding author needs to do so

When all the revision needed is done and the reviewers and the editorial board have confirmed the manuscript, you will get the acceptance letter.