Creating a game using HPL2

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So wich is recommended? UDK or one of the Cry engines, i'm totally thinking UDK as my laptop is not high end and isn't much a laptop for gaming, but it's enough for me. I run Amnesia on medium or a little higher, with the highest textures.

So the Unreal Engine is easy right?

If one would sell games with it, Does he have to buy some kind of license to do that or can he just sell it freely?

Game programming is not even close to being easy. Development kits like the SDK or UDK help you get started with it because you can easily create mods and implement your own custom features. The trade-off is that neither of these games' source codes are available to the public so making an entirely new game using the development kit is not feasible.

You can sell games you create using the UDK but you're going to have to consult the terms of agreement because I don't know the conditions under which you can use it commercially (you can't sell stuff you make with the SDK however).

There are plenty of completely open-source engines out there that you can use to create commercial products, most notably all of id's engines (because id are awesome).