how to select the keywords of PPC campain

As we all know,the keywords is very important to PPC marketing,but when a online shop has many kinds of product ,such as apparel,auto part,cell phone,computer,sport,telecom,toy etc,how to select keywords?this is a problem.
Could you give me some advice?thanks!

go to google adwords and use their free wordtracker tool. It will give you the demand for the keywords you choose.Higher demand equals higher vistor count

can I use the name of item as PPC keyword?

can I use the name of item as PPC keyword?

Yes, you can use most any word or combination of 2 and 3 word strings