HOw to run adwords campaing

how can i run targeted adwords campaign , i want to generate sales, tell me cheapest way to get sales

Look up some guides on adwords first before spending money.

Better yet, use a voucher on your first campaign so you don't burn as much money.

start with a keyword research, identify your competition and see what they're doing. In order to pay less for clicks improve you quality score. To do this you need relevant ads for your keywords and relevant content on the landing page. Structure your adwords account in smaller campaigns and adgroups in this way we'll have a clear view of whats working and what doesn't.
Depending on your industry, Facebook might be a cheaper alternative for AdWords.

The cheapest way to get sales is to choose low competition, low CPC keywords.

Use the adwords keyword planner to get this information.

Or you can just set your bids really low regardless, and hope Google shows your ads every once in a while.

Go study the guides provided by Google through Google Partners and get an Adwords certification. That should cover the basics of using the program and it's free.