You will need to file a Divorce petition before the Principal Judge.
– Maintenance is dependent upon your sources of Income which can be sources through evidences like Bank account statement and ITR of previous so many years etc.
– Also about how old your Issues(children) with wife are.
– Alimony is something which is mostly dependent upon judicial discretions.
List is actually endless and will depend upon your particular circumstance.
– Will your issues with the wife live with her or you?