You will get a lot of good advice on here. I'm no expert, but I think there are a few pertinent questions.
Was the bow left strung or unstrung?
While it was stored, was it laying down or standing on end?
Can you see any obvious cracks or delamination?
Was it stored in a place that was really hot for long periods of time?(high heat for longer periods of time is bad for laminate bows)
Laying down, unstrung and at a moderate temperature for storage is good, but not completely necessary. I heard of guys shooting bows with no ill effects after leaving them strung and hanging for 5 years.
If there are no obvious cracks or problems with the lamination, get a new string for the bow because it is way scary when an old string breaks. I would contact Three Rivers or Kustom King archery and ask them to get you the correct string for your bow. You will probably need to have bow in hand when ordering to answer their questions.
Then get back on here and ask lots of questions as they arise.
Good luck,
-Charlie