Ok, I have finally learned most of what I need to make a game.
Now I need to start writing my game.
I would like to make my own game engine for my game but am not sure were to start.

I am using C++/Carbon/OpenGL/OpenAL.

The game I am working first is a Galacian style game.

Any suggestions? Help?

Thanks

Start with a window and go from there =).
Allow your app to launch and exit smoothly and correctly
Have your user pick his/her desired resoultion
If you game is going to run in a window get that all set up
Get your drawing loop working

Once all the basics work then you can start adding sounds and other fancy things.

Galaxian was a lot of fun. I hope your enemies have some cool attack patterns.

Never thought of that...
How exactly would you program attack patterns?

Welp, in my iDevil game (which is vaguely Galaxian-ish) the enemies moved in formations like figure 8s sine waves, etc. These are all pretty easy to do. You can just use some math formulas to position each.

I actually gave them all waypoints. They move from point a to b to c, etc etc. and then loop back to a when they run out of points is their path.

The Boss, for example, moved in an inverted star pattern.