1.Can a case of maintenance be filed and if yes how much .My annual fees is 1.2 lakhs.
You can claim maintenance from your father. How much will depend on how much you say his income is and also may not be eligible for education fee to the extent of what you have paid.
2.Also what about my marriage expenditure and our share(my and my sister's) in house which is in name of my deceased mother.and how we can claim our share.
Actually it is the duty o your father to conduct the marriage and bear the expenses. You and your sister have 1/3rd share in the house which was on your mother's name, you can claim a partition and a share out of it.
3. Our share in ancestral agricultural land in VILLAGE.
You can claim a share out of that to.
4. Does my step mother has or will have any share in house or agricultural ancestral land in future after my fathers death.
Yes, she can claim a share out of your father's share being his legally wedded wife.
5. Any family lawyers in Jaipur to contact with.
There are plenty of lawyers available in this forum itself.