Your question:"I am interested in buying a foreclosed home in Southern NH. Where can I get information on how and who to talk to? This will be my first home."
Would your reason for wanting a forclosure be that you want to save money? Don't count on a foreclosure being cheap, the bank wants ALL the money and will be a tough negotiator. And think for a moment about how a house comes to be foreclosed. Usually it was owned by somebody who couldn't afford it, and who therefore probably skipped routine maintenance--so you can expect the condition to be "iffy". You might expect pipes to have frozen or the roof to have leaked.
Here's what you should do. Find a buyer agent, and "sign him or her up" to work FOR you! (I would start by asking friends who they used and if they liked the agent. If this is non-productive, visit several real estate offices and ask to meet an agent who would handle a first time homebuyer... Discuss with them what you want in the way of a house. Ask how they would represent you. Also, get pre-qualified for a mortgage. Your lender will help you with the amount of your down payment that you will need to make a purchase. While you are at it, find an insurance company, most will give you a discount if there insure your new home AND you car--in short be ready to buy BEFORE you make your offer.
You are clear in your request that you want a deal, but deals come with 1 bedroom or more, deals may or may not have a garage--see what I mean. What do you want? Figure that out and then look for that house, and then when you absolutely know what you want, look for one that's a deal--maybe it will be a foreclosure, maybe not.
This is good advice and it's free...