Here is a brief response to your questions.
1. Meet with a loan officer / mortgage broker, to get prequalified. They will review your last two years tax returns, bank statements, debt, income and can determine how much you can afford to purchase. You can then contact a local realtor to begin your search.
2. The amount you have to put down will determine on the development and the bank, you can put as low as 3.5% down of the purchase price to 20%
3. The interest rate will be based on the type of loan, down payment (FHA, Conventional, 15 year, 30 year etc.
If you have any additional questions, please do not hesitate to contact me.
Licensed Real Estate Agent