I encourage criticism to my post and the metrics within - so feel free to chime in. I'm here to play nice make contacts and learn from the community.
don't be a cowboy and play it safe - moving too fast is what destroyed many investors years prior - personally I'm a huge advocate of buy and hold. What you are attempting falls into my metrics for the current project I am working on.
Buy houses @ 125-185k tops, either get them from auction but there you have to be careful. A MUCH better way to get them is tight realtor relationships in aggressive rental markets. Find people that can supply you insider type deals - where you're not dealing with everyone in your area. They'll be able to supply you with pre-negotiated short sale listings you may have 24-48 hours to get a contract on before they list - if you can get these they are gold.
Aim for 8-13% CAP, buy in nice areas that are appreciating and rent to young professionals, don't be greedy with your rent. If you run these numbers, lets say 150k is your avg, when comped out to rents in the area try to hit 1200-1300 that puts you at 8-8.6% roughly which is nice. You're not hitting nice juicy 10-14% rates, but you also have appreciation/low risk/low rehab costs potential problems, because you're buying shorts that were willingly let go to cut a deal with the bank. Yea.. this process is tedious, yea you're not hunting juicy flips and getting immediate satisfaction. You are however getting 8-12% on your money fairly safely though - really depends how much value you put on that.
Also - whether you agree with my strategy or not, the MOST important thing is find metrics that suit your style, and do NOT deviate no matter how good the deal seems. You need to run a consistent strategy.
I'm not sure what other property managers do /say they'll charge however my firm will be taking 10% and first months rent some people like it some don't - you get what you pay for, and of course you can handle it yourself.
You will need 19-22 homes bought within these metrics WITH CASH to achieve your 25k with little room for error. Remember, the key is to move slow - and patience will save you.
Is there better ways to get returns on 3MM? You bet there is - if you have that kind of cash, or even slightly less - just become a hard money guy and bridge transactions for people - stay outa the market yourself...