Hey, @Ethan M.!
Make sure you ask your Realtor one critical question that rarely gets asked... "How many rental properties do you own?" Those who have experience in the rental market are the ones I would listen to. There are a lot of fake teachers out there who dish out garbage information that loses people money, so make sure you know where they're coming from, experience-wise.
Going to Rentometer.com will get you a few free rental reports. Put in the city you're looking to invest in and sign up for the trial for the free Pro reports. This will give you a general idea of rents in that area. Then, put in the address of a specific property you're considering and run a report with that.
Regarding appreciation, I like to focus on things I can control. Cash Flow, Depreciation, and Loan Paydown are things that I have some control over. Appreciation is based on what other people in the market are buying/selling properties for. This I have zero control over. Make sure your returns from Cash Flow, Depreciation, and Loan Paydown are solid, and don't worry too much about how much the market values your property. As long as you're making money, who the hell cares what they think anyway?
Buying a break-even property in hopes that rents or the price will go up is a buy, hold, & pray strategy, which I stay completely away from. Trust your numbers and make sure the property makes you money. Ask your broker to send you an RPR Report (Realtor Property Resource) that shows the market activity in the neighborhood, city, or zip code you're looking in. This helps as well. They can also send you demographics.