Member Site plugin Help

Hey community! New developer here looking for the best plugin(s) to fit my needs.

I am looking to create a b2b membership site where users login and are taken to a landing/profile page. I’m thinking that there will be 3 user levels. Highest will be admin (me). Second level is moderator(profile creator). Third level, lets call them consultants, will be individuals that the moderator allows to help with the project. Once logged in, Moderators would have access to different features based on which membership package they chose. Moderators will submit any documents or forms to the administrator. Moderators will also have power over which consultants are allowed to work on the projects.

Users should be able to integrate their email marketing lists they have as well as any social media marketing accounts they use.

Privacy is very important as the documents and data will be sensitive in nature.

I don’t want to spend anything on plugins until I’m sure I have the correct applications to do the job. Let me know if you need any other information from me.

Thanks in advance!