This is actually not a MS question, so maybe wrong forum... anyway...

As i quit from SS, my incoming in MS world just down to almost zero. I'm just getting between 1 to 3 dollars with my Dreamstime account.

I never upload pictures (i am vector designer), i still have no camera but i will get one as soon as posible; but not to upload to MS but to use in my new projet that is a blog where i will try to do some niche marketing related to my main profession.

I will use some pictures of some models to use in some ebooks, printed books and blog articles, but i am worry about making some mistake and get future legal issues because of the improper use of someone image.

I have always worked ethically and I will not use someone's image without authorization, but to fill the proper papers is pretty important, i think.

So, as this forum collects a lot of experience in the field of photography, I want to ask: What papers should I have the models sign to ensure the proper use of these images?

You're looking for a commercial model release.  The document permits you to use the model's likeness in your projects.  There are a bunch of samples out there.  I use a slightly modified version of a release provided by Getty Images.  It has been accepted by all the microstock agencies I've used it with, and spells out how the model's likeness may be used.  It won't keep a particularly troublesome model from making noise, but should keep you away from any legal action.

Thank you for your reply, i think i can even found it in several languages.

I've always been curious about something; these sample model release are actually not associated to any photo, i mean, there is no sample of the photo you are talking about when the model sign it. How to know which batch of photos these papers belong to?

Thank you for your advice Jo Ann.

If i use the same Getty contract papers everything is ok? Is there is no thing like "contract copyright inflingement" by using them papers??