I'm in the same position, only it was my husband who announced he wants a divorce 2 weeks ago.
I would also recommend Michele's book. Read it, it has a lot of advice.
But in the meantime, I would recommend that you do not try to force your wife to go to the therapist. Maybe say something like...."I booked a therapist appointment. I'd like you to come, but it's OK if you do and OK if you don't".
Also, this may help...I was talking to my girlfriend yesterday. She left her live in boyfriend 3 weeks ago and moved out. I asked what happened and she said she felt like she wasn't in love and asked him for some space to sort her feelings out. Instead of giving her that space, he started pursuing, professing his undying love, calling up her family and friends and crying to them. All really needy, unattractive behaviour. Needless to say she's not impressed and is even more determined now that moving out and leaving him was a GOOD move. She actually said to me it was the best thing she has done. So if your wife has asked for space, give it to her. In the menatime, work on yourself and do things that make YOU happy. If she initiates the conversation, be positive and upbeat. Good luck!