Have you decided to take divorce from your wife, in that case then you must first issue a legal notice seeking divorce and this must be duly served on her.
My advice to you would be to first issue a legal notice under RCR, asking her to come and join you with your daughter if she fails to reply or comply with your demand then proceed to issue the notice seeking divorce from her.
After filing for divorce if the flat is owned only by you then you can evict your wife out of it, if not till the divorce is granted she can claim right of residence in the said flat.
Maintenance has to be paid, if you pay voluntarily now, then she will not demand it through the court, if not she will claim maintenance through the courts. In any event, as a husband till divorce is granted you are liable to maintain your wife and daughter. I would say an amount of Rs.10,000/- p.m would be the like sum that the court will award towards maintenance.