Build An Agency Website

Would like to open a real estate agency. Would like to have a website that can upload and download files in various format. In it has some free software or link so as to ensure visitor to have no difficulties in opening and converting the files or folders he/she download from and upload to my site. It must also be right to the phone, ipad, tablet and PC You should also open an account for me in some popular social media and connect them to the site so as to form a good network. It can easily be found in popular search engines. Also, it must have a page where it show my bank account or what ever information, so as to receive payment.