Where do I enter the income from a owner finaced mortgage?

I have already entered the interest we collected but it always says not to enter income from the loan there that it will be asked for later.  Last year it took me almost a month to find out where to put it and I can't find it again this year. I don't want to spend forever looking for it again.  Can someone direct me to where it is?

Second what do I do if I won a product at a show, simply attending was the entry and I won because of the seat I was in.  I had to fill out a W2 form to receive the item but I have not received any 1099 or WG form from them what do I do concerning that?  Where would I enter that informtion?  Do I even need to enter it, how do I determine the value of the item if it was used as a demo model at the show?

Thanks in advance.