Technically you can be forced to remit all collected rents to the former owner, because you were never legally entitled to possession.2) They can file suit against you and ask the court to declare the sale void.

Also, if anybody has any good suggestions as to which websites or resources they use to find their market data I would greatly appreciate the feedback.

Even if so, you're almost never allowed to collect double rent. 

It collects from a variety of data sources.

Roofstock Zack: “We are making sure your PM, Marketplace, will receive the security deposit, the tenant info so they can collect rent payments, and the keys if available”.

Wait a minute are you saying that owning rentals is not a passive investment and you can just pitch it to management sit back on your barcolounger and collect mail box money ????

Can you provide some links to resources where I can learn more?

They'll collect your email and phone number and send you deals directly.If you want to take a direct approach to getting deals on your own, you could get in direct contact with homeowners who are interested in selling their home but haven't listed the house for sale yet.

I am seeking advise on a good online tenant rent collection company please.I currently use Clearnow which charges $14.95 for the first tenant and $2 for every tenant after that. 

You cannot continue to charge the old tenant rent while collecting rent from the old tenant.