froms 2 row

To restrict the countries which are shown, you can use the gform_countries filter http://www.gravityhelp.com/documentation/page/Gform_countries . However, you are going to be removing all but 3 countries, which is a lot of work. Instead, you could just add a new drop down and include only your three countries. That would not be part of the address block, but it would be easier to accomplish.

I think for your other question, about a second row for the formular, do you mean a second column for your products, so the list is not so long? If that is the case, you can use gf_left_half and gf_right_half CSS Ready Classes. Your first product will have the CSS class of "gf_left_half" and your second product will have the CSS class of "gf_right_half", and you will alternate back and forth until you are at the last product. Please see the documentation here http://www.gravityhelp.com/css-ready-classes-for-gravity-forms/

For the font size, Rob is right: we need more detail. Which text do you want to increase in size. Tell us exactly and we will help you target that text specifically.