Yes you can certainly get a loan to renovate the home. Depending on your down payment, you will have several options. You can contact me directly and also download a full renovation guide. Go to my website for more information.
Hint: Don't use an ordinary home inspector. Use the government-approved 203(k) inspector and save $$. Otherwise you end up paying twice for inspections.
2) possibly, depending on the price of the existing property and what you intend to build
3) most likely
My best advice here is to talk with a Mortgage Broker. WHY? Because you will need to understand the financing hurdles befor engaging a Realtor to find the right property. The Mortgage Broker you decide upon will more than likely refer you to several Realtors that can locate the property for you. Money 1st, property 2nd, Good Luck!