Well fees depends on the lawyer you choose but It will not start less than 1 Lakh to 2 Lakhs. If you have finance constraint, you could opt for the legal aid from supreme court. There are Lower Income Group Scheme and Middle Income Group Scheme. You could google out "Supreme Court of India Legal Aid."
The time requirement depends but approximately you could consider around 3 to 6 months.
Husband applying for transfer petition will be the toughest job. In transfer petition too court are discriminated towards female, unless you have some serious issues to travel.
Best of Luck..