Ensuring Secure HTTPs Connection

Ensuring Secure HTTPs Connection

Well i am implementing a Account Login system in my application in which i
want to make sure that all the connections are secure so the user can't
simply redirect the client connection to a mimicked server and gain access
to the app without my permission. So here is the procedure i am imagining.
1- The HttpClient Connects to my SSL page.
2- Makes sure that the connection is secure (maybe by checking the
certificate or something).
3- If the connection is secure it sends out the login credentials.
4- It receives the answer and if the account is valid it goes on, if not
it terminated the connection.
So as you see my plane is very simple and i think it will be good to
prevent some abusers or hacker from gaining access to my app without my
permission and it relays on the powerful SSL certificate system; However,
i don't know how could i implement this in real code so i really need your
help illustrating how could i make sure that the HttpClient has connected
to my real server using SSL and not anyone's fake server.