I would highly recommend that you do searches online where you can find basic articles about SEO – enough to get you started on your own. Many so-called ‘SEO gurus” are really scams and want to charge you big money for information that you can find out on your own.
I’m not sure how long you have been in the industry or what you budget is, but personally I would reserve from paying large amounts to SEO companies until I have enough revenue to be able to risk loosing some $$ in case they do not deliver. Just my 2 cents.