You attract them the way you would attract any other guy. You look at your best features(physically, mentally, emotionally etc) and put your best foot forward. You look at the things that make someone a good partner and work on those too. White guys aren't magical creatures. They are human just like you and me and more often than not they are just looking for good and attractive partner regrdless of that persons racial background. Culturally there are certain behavior s and tastes associated with white folk and if you are willing to change who you naturally are to be similar to them it will be difficult, but I suggest you study the behavior of the white girls and see how they snag white guys.
Guys are guys. Race doesn't change anything in terms of gender and personality varies from individual to individual. If you respectfully let him know, he should respond. Just like if you approached a Black man or a man of any other race. If you approach and he feels you're his type, you shouldn't have any problems at all.