Also which companies are actually reputable to deal with.

So, the idea is to buy a reputable Property Management Company to gap my lack of creditable experience and lack of credit, in order to get financing for buying 20 to 50 unit Multi Family properties.

Make sure you do your research on the reputation of anyone who might offer to help you so you don't end up in hotter water (there's a lot of great people on BP, but that doesn't mean everyone ) You may have to give up more of the future profit than you'd like-- but at least you'd stand a chance of getting to a profitable point.

A reputable seller that stands behind the notes they sell has more credibility than some random unknown seller on one of the exchanges.

would anyone please recommend a good plumber in philadelphia?

Most wholesalers I have worked with will already have a file opened with a reputable title company.  

It helps to be familiar with vendors too, my rule, ignore small unknown sources for maintenance receipts/charges as many play games, larger reputable companies will have more standardized pricing.If you can determine vacancies from lease files, good, but still be careful for leases that can't be verified by lease receipts/deposits.

- Emergency Maintenance (Plumber, Electrician etc.)- Lawyer specializing in landlord tenant law (again you can use your landlord association and get familiar with local laws for bad debt collection, evictions etc)- Police department, do they have community outreach programs that you can join to decrease chances of crime (Cameras and lights are great, but prevention is best!)

Then sub out the rest of the work to good plumbers and electricians.I have one good GC I do refer because I know he is big enough to handle everyone and he does fantastic work but you would only want to use him on high end ($300k+) homes.If you ever want to sit down and chat with other investors or Realtors feel free to reach out to me I am always happy to meet more people.

So, plumber came last week and installed new tubs.