Driver for dollars to cold calling

[Justin Scott]

The FACTS

Yesterday I went driving for dollars and I finished with 13 addresses that appeared vacant. 

I entered the addresses into Thatsthem.com/address in an attempt to retrieve the associated phone numbers. 

Got 3 numbers out of 13 address

2 of 3 were the correct number

No one picked up(left 2 voicemails).

The ASK

What is the best website turning addresses into phone numbers?

Is this the best way to start out looking for properties to wholesale or should i purchase a list to do direct marketing?