It's annoying having to maximise an application's window over and over again when you open it—especially when you know you always want it maximised. This oldie-but-goody shortcut trick will cure what ails you.
To fix it all you need to do is right-click on the application shortcut and select Properties. Under the Shortcut tab change the Run dropdown to Maximized.
That's it! Now any time you open that application it will be full screen.
Make Apps Always Open Maximized [How-To Geek]