The amount you spend depends on how much you can afford. I’ve worked with clients who spend $200 per month and some who spend $90,000 per month. The one who was spending $90,000 per month started out at $20,000 per month but was seeing very good results in getting leads for their company so they continually increased their budget.
I’ve had clients who was spending a lot of money in Yellow Pages or other places that wasn’t giving them proven results so they moved it over to pay per click so they could track their leads better.
If you are worried about blowing your entire budget all in one day then you need not worry. All of the major pay per click advertising services allow you to designate how much you’re willing to spend on a daily basis. Once you’ve spent that amount for the day, then your advertisements are turned off until 12:01 A.M. the next day.
For example, if you want to spend $900 per month, then you should budget $30 per day. This will control your spending so it doesn’t go out of control.