build a website

i would like to build a website for my company
kenseller.com, which already has a site that needs upgrading and add on.
The company is based in Kenya, and shall be a general website dealing in
1. Real estate - buying and renting of houses &offices
2. Buying & selling of cars & auto spares
3. office furniture & decor
4. hardware, gardening & house hold goods
6. Farming & gardening tools
7. art &sculptures (jewelry)
8. undertake renovations & Construction works
9. general supplies & distribution/ wholesalers
10. to have a chat center, and linked to our social media platforms
i would also appreciate a software for generating all financial and administrative documents and reports which shall be viewable by landlord and tenants alike in relation to property management.
kindly follow the following websites to see what i desire and the layout of site
Buyrentkenya.com
jiji.co.ke
https://hassconsult.co.ke
commercialpropertykenya.com best
property24.co.ke
pigiame.co.ke
kindly send me your quotation inclusive of prices, scope of work and time frame.
regards
Anthony K.