Welcome aboard pw_ch.
Like Mikhayl suggested some more details about your game concept.
The engine.
Goals and visions.
Yes I guessed it was about making money.
Sub games are alway exciting because its an area that many average people know nothing about... What lies under the sea? What protects our borders? Who are the men that go to great depths to keep the peace and order.
So if you target Console market you better make the control simple and easy.
For PC there is no limit other than the limit of each level of PC consumers have.
Min and max requirements to consider when making a game.
Multiplayer.
So basically doing some marketing research and look for what people mostly want in a sub game.
Options?
If you do WW1 or WW2 then try to improve on what is already out there. Ideally realistic immersion in a game yet for those who want simple for a quick game fix easy playing.
If modern sub game you need contacts to get access to military mission being preformed in the last 2 decades. Even if you have to change a few names and locations.. Even some theoretical scenarios that the USSR and US made during the cold war upto today.
If future no limite to what you can do as long as its believable and reasonable.
Hard to say PW_CH.
Your graphics are impressive.
Fraps will alow you to record your images on screen so you can make a better trailer.
Very cool idea you have an for my opinion I would love to see a new quality sub game.
As long as you moto is quality rather than quanity.
I know you want to profit. But pls profit the right way and respect your clients.
Goodluck.
WH