You need to invest 2 things to make autoblogging profitable.
Time and money.
Start with Time to learn the concept, the tactics and the do's and dont's.
When you understand what it's all about you will know what you need to get started and what to buy. Can be scripts, content, outsourcing, servers, domains.
You could buy a couple of aged sites at Flippa but if you don't know how to maintain them them it will be a waste of money.