Actually I'm quite a beginner with XNA, but I'm a decent C# programmer. I have experience using Visual Studio. This is for my high-school programming class, but the teacher gave us two days to actually develop this game. It's due on Thursday.

I just got an XNA book. However, there are quite a few things it fails to explain to my satisfaction.

Here's my objective: Create a Windows game using XNA where two players shoot back and forth with tanks. This is meant to demonstrate trajectories.
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Game Requirements:
~ There will be an obstacle to shoot around.
~ Players can select the power and angle to shoot at. (Text input probably)
~ Turn-based
~ Probably best to use a mouse and two textboxes to set the power and angle. I'm using one set of controls for both players.
~ Random wind to change the trajectories, only two directions (left/right).
~ If the shell goes out of the screen or hits the obstacle, it detonates harmlessly.
~ Saving wins and losses between player one and player two.
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What I need:
~ I know I'll just create a few classes like a tank class, an artillery shell class, and probably something for the obstacle in the center.
~ I need to figure out the Vector2, Velocity, and Position classes, as well as any other class I might need. Also I need to know how to use the update method in relation to key inputs and positions for objects.
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What I have:
~ Artwork, like a tank gif and shell gif.
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That's it. Nothing too complicated, I can add multiplayer capability for fun when I don't have finals riding my ass.

Responses are appreciated, just giving me links are not as helpful to me since this is supposed to be a learning experience for me.

.cs files are semi-appreciated too.