I have this buyer in Los Angeles who wants to buy vacant land and build properties to sell (he does have $$$). I have never dealt with this type of a buyer. My plans with him is to acquire his land and have him build on it. When he is done with the construction I will sell his properties. What I dont know is how do i go about pulling out numbers to see if its worth his money in investing in this process. I also want to know if he deceides to go through the process what type of people does he need to start talkingo too. Do I need to start calling contractors and such? help!

Sounds like both he and you are total beginners at this game (nothing wrong with that we all start somewhere). You might consider referring this out to get a piece of it instead of nothing at all or worse yet sued. Make it a contingency in yoru referral that the agent ytou send it to lets you watch from the sidelines and learn.

You could go to topic "DEVELOPMENT" and check JB CONTRACTORS, read and contact

Your answer depends on what your investor is building? Commercial or Residential.
Does the investor have developement experience? What exactly is your role to be?

This would be on a residential and not commercial. right now the property is 24,000 sqft. and half of it is being used as a SFR and the other half was used for horses. Therefore, the right side of the land 12,000 is vacant and and flat. The owners want to sell it and I have a buyer who wants to build some homes in the vacant area. (this is all new to me) I dont know exactly what role I will take or should take but I am not going to jeopardize my carrer for this. That is why I'm posting. So far I've been reviewing the comps and I have the information on what types of properties have sold in that area and what they are going for.

Tomas,
First you need to determine the exact lot size and if it has a seperate tax id number ands there are most likely restrictions on how many lots it could be devided into( could be 2 lots depending on shape. Also check its zoning. Check with local building codes regarding setbacks. In my area that 10K sf lot would have a SFR or maybe a duplex.