My dear man
it seems to me one of you is going to have to be the first to speak his true wishes. perhaps it can be you, seeing that you are the man, and most woman still prefer it the conventional way.
My advice to you is to figure out with yourself what you want, and then buy a nice boquey of flowers to back it up. tell her she is the woman on your mind. that she is the one you seek advice about, that she is the main female character that interests you. spend as little time as possible talking about relationship and as much time possible enjoying your time together. speaking about it ruines it.
find things you both love doing and do them. get to know her children, their hobbies, their dreams and aspirations. take the whole bunch of people to the zoo, or ice skating, ot whatever you guys like to do, ask them what they like doing.
its about being together really, life is. build trust by being there, by not judging the pace. its ok to love someone, and to even say it.
good luck.