@Mark S. A lot of much needed information to make a good judgement is missing here. Information such as, mortgage, property taxes, insurance, repair costs, ect.
That being said, there are a few rules of thumb that help investors quickly filter out leads. Please note that these are by no means deal makers, you should ALWAYS use due diligence to get as close to the true numbers as possible.
First, the 2% rule. The 2% rule says that your monthly rent should equal 2% of the purchase price. Using your numbers, 475/mo rent would make your purchase price $23,750.
In some markets though, 2% is pretty rare, so some people use the 1.5% rule. This rule says that your monthly rent should equal 1.5% of your purchase price. So, 475/mo in rent would make your purchase price $31,666.67. Obviously, 2% is better than 1.5% for us investors, but like I said, in some markets that may be hard to obtain.
Also, their is the 50% rule. The 50% rule says that your monthly expenses will be 50% of your monthly rent over time. For example, again using your 475/mo rent, your expenses will be 237.50/mo. Keep in mind this rule does NOT take into account your debt service/mortgage. So, if you had a mortgage, you'd take 237.50/mo (expenses) MINUS debt service to find your possible cashflow.
Again, these are only rules of thumb and you should always calculate the all the expense/mo you can think of. Lots of time should be taken to research the different expenses one might occur, as I can guarantee as a newbie you will not figure for all of them.
I am a newbie as well, so hopefully others will chime in and help out also. This is all information I've gained by reading BP and different books the last few months.
Hope this helps, Tyler