you are going in the wrong direction. The technology indeed is so advanced that people depend on the internet for evry other thing.
Comin to the topic, here think, do you really need the help of a site to start up. Its just about putting some stuffs together. What is that more info you need?? a specific question will be of great help.
have you done with these:- you need to control the gate. what do you need? you need some mechanisms which convert electrical energy to mechanical? What is it? A motor? if so how do you set that up. A gear? a belt? A chain? just work around those first. take some time to think. the project being electronics related, you should have studied about the basics. use those skills, and limit the dependency of a site.