Dardaigh: Should i ask for a resume before hiring someone to do outsource work?

I think that you could ask for references. I see nothing wrong with this. If they have a problem giving you a reference, then you may not want to hire them.
Here are some other things you may want to ask them for:

• 
  How much experience they have with SEO.
  What forums they have all worked on or had experience with.
  Ask if they can provide you with some samples of work they have done.
  

Ask for references, check his feedbacks score and look for positive reviews. Also talk with him before hand. If everything turns out good start with buying small test services. It everything is delivered fine you can continue...

Ask for references, check his feedbacks score and look for positive reviews. Also talk with him before hand. If everything turns out good start with buying small test services. It everything is delivered fine you can continue...

Before hiring SEO Expert,Always ask him/her total experience in SEO field,check him reviews,demand for achievements or goals as he/she has successfully done.

You can always ask for some examples of the work they have done. Otherwise you are jumping in blind

well its up to you...

asking resume will be good as u know their experience and skills