Buying property at auction in Phoenix AZ

Hi everyone,

I am looking to buy a specific property at auction in Phoenix AZ.  I will not be able to physically be there at the courthouse.

1) Is there a reputable service/agent I can use who would bid on my behalf?

2) This is the first time I am attempting to do this, how would I research title insurance issues prior to buying a foreclosed property?

3) Any other big gotchas I should be aware of?

Thanks!