Troubleshoot the proxy software on the VPS (Ubuntu)

I'm trying to set up my own proxy server in the US using the virtual private server on Ubuntu 14.04. I installed 3proxy and configured, opened the port, but for some reason can't use the internet through the proxy. The proxy software launches successfully, but when I test in the browser on the client side it asks for a password and looks like connecting, but I can't browse internet from thought the server.. Looks like the firewall is disabled also. Need someone with the knowledge on ubuntu to troubleshoot this.. Also looking for constant help on the tech side in exchange for the server time or computing time. I can provide you with virtual private servers in almost any region with any number of cores/memory - depending on the help you can give in [login to view URL] use for computing, hosting, etc. I need help mostly with Ubuntu/php/sql/json