Well. Hard to post it as I get the same message. Tried to post half of it and still couldn't for the second half. Then tried to post every sentence on its own and that went well. Odd.
Get all of those first and see which fits you better. You can get all of them in the Mod Making Tool section. Some might be a bit outdated but that's not really a problem for now.
Next important is the "knowledge base". You can find some easy tutorials and file guides which explain how all txts work. Also best is to start taking a look at the vanilla game files as ES files are quite messy.
As you probably run into problems feel free to ask for help, maybe best over skype if you use that.
Cheers
Can post it in Quote's, without I can't.
Cheers
AlphA