Creating Submission Forms for Content Types

Hello Everyone,

I can never thank enough to folks who helped me make my backdrop journey a little easier during the past few days.  Now, I have generated my content types and views for them as well. It is primarily a membership site. I want to invite potential members to fill out a form giving all the details needed to submit for becoming a member.  For this I have a few questions.

1-: Do I need to generate separate submission forms for all the content types I have generated?  These content types have somewhat different data requirements. 

2-: How to generate these submission forms?

3-: Once the admin receives the submitted forms will the data in these forms be automatically populated in the respective content types after approved by the admin?

Thank you again for the great support I have received so far from many of you.

Kind regards