If you can pick up an older home in an expensive area for $150,000 do it. Just be aware you'll have to probably upgrade the plumbing and the electrical, and deal with structural issues. Everyone should get a property inspection before they buy a house, even if you're buying "as is." You need to know what condition the property is in, and what needs to be done. Getting a fixer upper in a good area is a wise investment.
OP, start by going to open houses and talking to the realtors. Also go online and look up the best realtors in your area. They always rate them. The state realtors association will tell you who the top three sellers are. Realtors who have won awards will post it in their marketing materials. There are websites all over the place like Trulia or Zillow that rate realtors.
Frankly, the only way you're going to get shown a house, aside from just walking into open houses, is if you sign up with a buyers agent. Determine the areas you want to look into, go online to one of several millions of websites that will tell you how much house you can afford, and start looking. Window shopping on Zillow or Realtor.com is the best way. Then set up appointments with your agent to see the ones you're interested in.
When you find THE ONE, make an offer. Always go lower than the listed price. You can negotiate up if you have to. Usually, your offer is pending an inspection. Listen to your agent. They 'll know what comparable properties sell for, or if your offer is too low to take seriously. They will also know if the seller has turned down other offers that were too low, or if the seller is desperate to unload, etc.
Your offer is accompanied by a check, usually around $500 -$1,000 or so. If you back out of the deal, you can lose your deposit. If the seller refuses your offer, you get your money back. If the inspection turns up a problem, you can get your money back if you quit the deal. If your offer is accepted, and you have been approved for a mortgage, then you wait for the closing. Before a closing can be scheduled the seller's agent has a title company do a title search to make sure the title is clear of all impediments. The property has to be appraised by the lender to make sure they aren't lending you money for something that's not worth it.
Once all the legal hurdles are overcome, a date is set to close. This allows the seller time to fix anything you two agree needs to be fixed by the seller, and it allows the two of you to decide when you can have access to the premises. Once you close the deal the property is yours. That means if the seller doesn't vacate the house, he has to pay you rent for every day he is there, rent being a pro-rated portion of the mortgage payment.
IMO, what you really need to understand is the financing process. Make sure you pay attention to that with the various lending institutions. Educate yourself. The other thing to understand is, you have to get a clean title from the seller. All liens and impediments have to be cleared by them, and they have to be the authorized seller. Sometimes adult children of the elderly are attempting to sell the house without legal authorization, so make sure the seller is authorized, or is the actual owner. These are the things realtors and title companies handle. That's all I can think of for now. The seller pays the commission, and the closing costs are negotiable. Sometimes the seller will cover closing costs to sweeten a deal, otherwise the buy has to cover them.