Build a website

What we want??? We want online portal which is similar to freelancer websites. how it works???? SIDE：A There are different projects posted on our websites under different categories (say project# 01 to project #100) in category (A to Z). This project is posted by either administrator or either end users who want work (the same as i post on [login to view URL]) The platform must be as simple as possible, so that peoples can post more and more projects online in all categories with their estimated offer of works. Side:B XYZ is an optical engineer, and he found that problem # 055 in category 'G' is exactly same to his research field, and he can solve that problem. so XYZ will register himself quickly on the website using mobile number verificatoin/email verification, and answer the problem "personally or openely" After he give answer of the problem, the administrator receive a notification that problem number 055 has been answered successfully. The XYZ wil receive the page for choosing information of bank details and submit it and waiting for the administrator to approve the problem solved correctly. SIDE:C The official bank account of administrator had been synced with the website. As administrator click approve, the automatic invoice will be generated and send to administrator email as well as XYZ email instantly. Administrator will manually transferred the payment to the XYZ account, and upload the receipt of the payment on the system, that will store on website, as well as send to XYZ user as well. The generated invoice can show the payment in USD/INR or any required currency. for beauty of website DUMMY payment options can be listed such as PAYPAL, WESTERN UNION, MASTER, VISA etc etc (administrator when registered paypal and western-union on the company name, he can then integrate these payment platforms as well) There should be a counter on website which showing that Number of Problems Number of Problem Solved Number of tutors etc etc etc SPECIAL CARES: As this is the online business, so we must be very very careful in monthly and yearly generated reports, because we must need to fill the tax returns on monthly or yearly basis, so all the above work must be precise and accurate without any trouble. So is it simple???? That's all we need. Please mention your offer to me (i will surely pick the one with lowest offer) Awaiting for EXPERTS (Peoples from CHINA or PAKISTAN are warmly welcome to do this task)