green eyes normally means they have a silky coat...but not a for sure tell...as far as things at petco for skin and hair...hmmm i myself have not tried anything from there...
what i would recommend for you is to find a good pin brush that has no balls at the tips because that could cause breakage....i myself own several madan brushes...you can get those through a member here on YT...her userid is mimimomo here is a link to her for sale thread....
http://www.yorkietalk.com/forums/yor...shes-sale.html
but since you don't order online i am not sure how that would work...maybe you could send her a money order or check.....good luck!
and it is good practices to groom them daily...after the first few tries they will get use to it...i bath mine every 5-7 days..brush them daily if possible...even brush their teeth since yorkies are prone to dental problems..