Market Trends about prevalent rates of property in the vicinity and last known transactions.
Identify the property you wish to purchase.
Formulate commercial terms.
Distinguish between terms and conditions of the contract which are negotiable and those which are fixed e.g. price, payment schedule, time of completion etc.
Avail of services of magicbricks.com. List your requirements with a reputed broker.
Ask for photocopies of the all deeds of title related to the property to be purchased. Examine the deeds to establish the ownership of the property by seller, preferably through an advocate. Ascertain the survey number, village and registration district of the property as these details are required for registration of the sale. Previous encumbrances and loans, if any, on the property must be cleared before completion of purchase of the property. The title of the Vendor to the property must be clear and marketable.
Finalise commercial terms of purchase of the property. Ascertain transfer fees, stamp duty and registration charges to be paid on purchase of the property.
Ascertain outgoings to be paid for the property i.e. property tax, water and electricity charges, society charges, maintenance charges.
Request Vendor to obtain, if applicable, consent, permission, sanction, no objection certificate of various authorities such as the (a) society (b) the income tax authority (c) Municipal Corporation (d) the competent authority under the Urban Land Ceiling and Regulation Act (e) any other authority.
Will you require a loan for making payment of the consideration amount. Ask for a pre-approval letter from the lending institution.
Permanent Account Number of Vendor and Purchaser under Income Tax laws Payment of stamp duty on the formal agreement or document for transfer of the property, signing by both the Vendor and Purchaser and registration
After payment of the entire sale price, take over legal possession of the property alongwith documents of title in original from the Vendor of the property
Change name of the holder of the property to the purchaser in the records of the society, electricity company, municipal corporation, Index II etc.

The liability of paying stamp duty is that of the buyer unless there is an agreement to the contrary. Section 30 of Bombay Stamp Act, 1958 states the liability for payment of stamp duty.

Every State has its set forms under the Registration Rules that are required to be filled and filed along with and at the time of Registration of Sale Deed/Transfer Deed.
Under the provisions of the Income Tax Act and Rules for a transaction of sale, it is now compulsory for the Purchaser and Seller to give their Permanent Account Number and in the event of either the Seller and/ or the Purchaser would be required to fill Form 60 of the Income-Tax Rules.
In case of either the Purchaser or the Seller being a Non-Resident Indian, not assessed to tax in India, such a Party would be required to file Form 60 of the Income-Tax Rules.

Approved plan of the building along with the number of floors.
Whether the floor that you are buying is approved.
Whether the land on which the builder is building is his or he has undertaken an agreement with a landlord. If so, check the title of the land ownership with the help of an advocate.
The building byelaws as applicable in that area and ensure that the builder is building without any violation of front setback, side setbacks, height, etc.
Check if the specifications given in the agreement to sell of the sale brochure match on the ground or not?
Whether urban land ceiling NOC (if applicable) has been obtained or not.
NOC from water, electricity and lift authorities has been obtained.