Unity has some decent tutorials to get you feet wet with the language.

I would recommend picking up a book on the subject.

You'd be using the language for scripting the games.
You can fine some basic intro to programming tutorials on the web, but many of them are duds and just give you the same information.
I would recommend getting a book that teaches you how to script in C# FOR UNITY. This will teach you the most specifics that you will need.
Also, take a few hours every now and then to read through the documentation. This will allow you to get a good feel of the things that you can do with the engine.

C# is a great place to start out.

I would try and learn as much as you can from [ Register or Signin to view external links. ] , if there is anything you need help with feel free to PM me

Hey man I have recently been doing a lot of 2D Unity development, so if you need any help PM me. The odd part about unity is it's not so much focused on actually writing the code for your scripts, it's more so about actually using Unity properly. However, you will still need a decent amount of knowledge about C#. Feel free to PM me with any questions man

My best suggestion would be Khan Academy. I joined the programming start course in June and we have weekly tasks and progress is saved. I find it to be really good.