From what I have read, their measures seem to be the most effective.

The REO agents represent the banks and will disclose obvious maladies, but if a bank requests the agent to selectively forget something, it happens.

My recommendation, though not specifically about real estate, but the philosophy definitely applies to real estate is "The Compound Effect" by Darren Hardy.

Your mortgage lender is responsible for selecting the 203k Consultant for you.

Depending on the rehab 30-90 days.Rent - Select a great tenant - the property is now a producing assetRefinance - I always use local banks.

The effects of a collection a long-reaching in this way, so your best bet is to get this fixed ASAP and you be the one who initiates the contact. 

I dont think there is any minimum, really, but the effect of rehabbing brings up the price so the refi appraisal is where you need it to be. 

Someone also told me that advertising on Reddit can be effective and as cheap as $5/day. 

There's a lot to learn... figuring out the best investment strategy for you, crunching numbers, picking the right property, managing a renovation, selecting tenants and self-managing, residential tenancies act issues when things don't go smoothly, etc... 

Then, you can go and play around with some variables to see what effects what and how much on the spreadsheet.