I have a web hosting farm. So Now I want to increase my clients. And I want to use google adworld. is it possible to make atleast 2 sales per 100 visitors? I need to make atleast 2 sale per 100 visitors. and also I don`t want to set max bid over $0.07 so is it possible ?

Yes if your ad is good.
2% sounds perfectly reachable if your website and service are good.
That said, there may be better way to advertise your service

Yes, you can. However, you have to make sure your keywords are relevant with high CTR. Only then you can get lower min bid.

You can, but it's not AdWords itself that will make the sale. The sale will be more about how well you write the ad and if you target it to the right keywords. If you do you can get people to click on the ad. Then your site will need to convert those visitors into paying customers.

AdWords is used to direct traffic to your site and ideally qualified targeted traffic. Your site though will be what converts that traffic to customers.

I also need help about bidding on keywords. I found that most of the main keywords are incredibly high to bid on. How can I bid low and still rank high on adwords?

You want to look for different keywords probably. Instead of just the main ones like 'web hosting' look for longer phrases. Those phrases won't get searched as often, but if you have enough of them you can still get some good traffic.