I need a client dashboard/portal

We need a website made for us that includes an advanced custom client dashboard. Our company provides college counseling assistance to customers but focuses on Essay Review (which requires us to make comments and suggestions to a user-uploaded or user-inputted essay) and College Application Review (which requires clients to fill in their college application to us so we can review it, and send back a large body of comments). We also offer college counseling services (where we are basically their college consultant for a 3-month period). We need a professional website made for us. Our services have always been in-person, but we’re looking to go online now and do not have the expertise to make a client portal that would support employees’ work (checking in on their assigned clients, reviewing a client’s file, performing an essay/application review that a client purchased, etc). We need this site to be all-in-one — everything from payment to sales help to the actual essay/application editing itself needs to be done from the website or from a portal that’s connected to the website. A very similar website is CollegeVine.com. Clean and simple yet informative. Notice that they also have a client/employee dashboard attached to their site. We want this same thing. Employees and customers should login to the same portal but see different things based on their role. Employees should only see THEIR assigned customers (a sales manager assigns customers) and should be able to communicate with their customers, look at their profile, see what services they've purchased, and assist them with the services they've purchased.