Investor should be very careful when planning to buy off plan property. The most important thing to keep in mind while paying the token/booking money, it should be on the name of Escrow Account (account under DLD).
Secondly, investor can look for these factors such as payment plan, property size, service charges, location, time to completion, expected price appreciation, expected return, community, developer, public transport, area growth in next 5 years and try to get benefit from an offer if going on at the time of buying.
Once, you get property options from your broker go through all option and check for above factors and once you are satisfied with required information then make the payment online directly to developer (if trustworthy) or write a cheque on the name of Escrow account than you will get Sale & Purchase Agreement to sign and send it back to developer and after this once you will get your Oqood (A document issued by DLD declaring your ownership) you will become owner of that property and after that you will pay the installments and once all payment is done you will get your Title Deed.
Note: Investor can get more benefit if he will buy at prelaunch price.