I recently decided to use the French Defense as black against 1. e4

Here's an attack (I don't know if it already exists) that I made up (unless it already exists). Please give your comments. By the way, this opening is based on white playing 4. c3. I know he has other options, but this is based on that, so please tell me possible moves for white after 4. c3 so I can see if my attack using the French Defense worked.

Why's white in trouble?  Unless you see a fool-proof plan to gain material using the queen, don't bring her out.

After 6... Qb6 no matter what white does (unless you see something I don't), black is going to gain a material advantage.

As for 5. dxc5:

I do not see how this is good for white.

benedictus you get forked after bxc5 with b4 winning a bishop for 2 pawns

Oops.

white can play 6.Qb3

Let's look at this 

there is no trouble, i don't get what are you talking about

lol, "oops." :)

Good to be thinking of ideas like that, though, just make sure they work before you play them.