First time

So my man and I have been together for close to a year. He’s always been super respectful towards me because I’m a two years younger than him. I just got back from vacation and when I did I got sick so we haven’t seen eachother in a hot minute. He ,being his goofy lovable self, sends me weirdly funny cat videos all the time and this time he sent me a pair of white underwear with the saying it’s not gonna lick its self. Hes been hinting on the fact that he wants to eat me out for a while now. I’m completely fine with the sitch but ive never been eaten out before so it’s all new to me. Advice??