Create user script for chrome

Hello. Pleas can some one help.
I need script - sniper for auction: auction.violity.com
At the end I need to:
1. Add a link and the price for auction
2. The sniper must bet 6 minutes before the end of the auction in the field: "Auto auction"
3. Also need option, when I choose particular link, the program must notify me by phone or email.
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