Form creation

i have the form to insert vehicle with all the detail the form hast the insert you have to compare if everithing is correct and also have the option if the user choose any box automatically has to be filled in the description that way we can count the 250 characters and have the option to choose for zones abcd sencod part is to have the ipn (instant payment notification all these information has to be in diferent tables complete separate and create a page for results is someone choose a package )