223733 Site with backend needed

I don't want to go into too much detail, but basically I need a website set up as such: -Users purchase account for web site -Logging in, users have options such as: Tasks, Clients, Reports, few other things -Reports for example would be broken down into: Expenses, Daily/Weekly/Monthly/Yearly Income, Sales by area, etc. -Reports would also need to generate invoices based on reoccurring sales for each client I realize this isn't the best description, but you can see the basic layout of the site. Basically the main page is to sign up for service, log in, and then you have a back-end for the clients to use. No actual customers of theirs would be on here. I'm not willing to give out too specific of information about the site itself unless we come to some understanding that you can build everything that is needed. I haven't been able to find much online like this.