By your own words, Government scheme, you realize that this is likely not a real program. I've never heard of anything legitimate like this and most "rent to own" deals are heavily weighted to favor the seller or they wouldn't put their property at risk.
If you want to buy, meet with a great lender learn about the available programs and get pre-approved. There are some 0 down if you buy in a rural area or are a Veteran. There are Fannie Mae HomePath homes that require 3% down and don't have mortgage insurance.
FHA is 3.5% down and is the most common for first time buyers and buyers overcoming past credit issues.
Trulia is a great resource, but nothing compared to speaking one on one with a great local broker.