How much to build a house on land ?

[Francesco Tartarone]

I was wondering if anyone had any real life knowledge on building a new home and about getting a loan for construction?

Let say  I want to build a 3,000 square foot home would it be cheaper to build a module home or have a construction company do it. How much would you say it will cost on average on average per square foot?

Also, after it is completed would it be worth more than it cost me to build it? 

For Loans, I just want to know how it works let say I get a loan for the Land, and in 1 year I decided I want to start building.  Will I have to put down a down payment for the construction loan or will it be added to my mortgage?