Played the French but lost horribly. How do I improve?

Step 1) take the pawn on e4 on move 5.
Step 2) closing down the position ,while having your bad bishop bad, although you have 2 knigths.
Step 3) Study the plans in this positions a bit more.

Yes. I think Nd7 and play the queenside. You open your king too soon, with all pieces on the back rank.
I have some ideas but I'd like everyone's input! Nd7 instead of Ne4 I think was better, and I needed to get c5 in before I did. Thanks!