Where to find an experienced lawyer in divorced cases? She is married for 24 yrs.?

She is worried about her financial status after divorce. She has 2 grownup children. Will she be able to continue staying at her present matrimonial home with her children after she has signed the letter of separation from her husband? How long will she have to wait before she is granted a divorce? At the moment, she's given a monthly allowance. Once she signs the letter of separation, does her spouse have to continue to give her the monthly allowance which she uses to pay for her monthly bills like PUB, insurance premiums, etc.? Will her children be given monthly allowance if they choose to stay with her after the divorce? Will her husband have to support her children till they complete their university education?