I am going to put my "advert" up on a dating site any ideas?

I have decided to make some changes in my life! Long story, but one of them is to “get out there”. I am going to put myself up on a dating site. The thing is; in the past, I would place a lot of photo’s and get hundreds of replies. But not from the types I wanted to draw in really. This time, no photograph, so I need some tips on writing an “about me” and “what I am looking for.”. I am a professional person who would like to draw in other professionals. When ever I think of what I am like I go blank! So any guidelines appreciated. Thank you.