Online buy and sell

Am 23 years old lives in Sweden and wanted to start my own bussiness Here is the project I wanted a help with. People can register there as business or personal. Businesses will have their profile when will be listed all their ads. People can post these kind of ads: Jobs, Vechiles, Real Estate, Personal thinngs, Home equipments, Electroincs, etc. All ads will be reviewed firstly by ADMIN which will approve or dissaprove based on if they already paid the ad price by their mobile phones. All categories will have their own filters ex: at Vechiles you can choose what model do they want, what color, etc. SEO - Search Engine Optimization - which means that will help your website to rank higher on GOOGLE, but that will be based on your traffic, so the more traffic you get the higher you goes, until the first page in google. They will get a notification by email when you will approve their ad. They will get a notification by email when their ad will expire. Admin: You can manage subcategories (add, edit, delete) You can manage all your clients (businesses and personals) You can manage all ads. You can manage the price of ads for how many days (ex. 15Euro for 10 days, and 25Euro for 20 days). You will get a notification by email everytime someone posts a new ad. You will get a notification by email when the ad will expire. You will have reports like: Top 10 businesses that posted more ads, top 10 personals that posted more ads, top 10 viewed ads, most searched categories.