My boyfriend wants me to him in bed. How should I go about this and then what?

My boyfriend and I are very comfy with each other I'm usually always the one to say what I want him to do to me. For example I texted him yesterday and I said I want you to tie me up later and tease me til I beg you to put it in me. Sorry if that's TMI. So today I said well I want you to decide what we are doing tonight. He wants me to dress up in my cop costume and him. So any ideas as to how I should strat this off and where I should go with it? I really don't know where to begin. He likes it when I put my hand around his throst during and I always smack him on the *** during he said he wants more of that. Thanks in advance for any ideas: )