Me and my wife want to go to Italy for 1 week holiday. What document do we need to have? I visited England before, will that help me to get tourist visa for Italy?
You (an Indian) and your wife (assuming she is also a visa national) should both go to the Italian consular web site and create applications.
There is guidance on that site which explains what sort of documents they need as additional evidence.
For your other question: I visited England before, will that help me to get tourist visa for Italy?, they like a good performance history. It may depend upon how current your history is, but overall they like it.