How to role play??

I asked him awhile back with is some of his fantasy’s and he said he thinks a nurse outfit would be hot so I buy one I just don’t know what to say or do when I get in there lol I’m like super self conscious Iva gained some weight so I’m awkward lol but I want that crazy hot sex that a lot of y’all talk about I just don’t know what to say or do when he sees me help a sista out