Here are 10 things you need to consider first before appoint your own SEO company to help you:

1. Experience – Does the personnel act professionally?
2. Location – Able to meet the personnel in person sounds better?
3. Ethnics – Does the company follow Google Webmaster Guidelines?
4. Past Successes – Any successful project they worked on?
5. Case Studies – Any information to be shared?
6. Specific – Can they share what approached they will use?
7. Cost – How much?
8. Expectation and Measurement – How they measure the result?
9. Implementation Help – Can they provide on site training, guidelines or sharing?
10. Time-frame - When they can start and when it can be done?