Enlisting in the Army Reserve is broadly the same as enlisting in the regular Army (in fact, many people come to the Reserve after their active duty service requirement is met). To find out if you are eligible to join the Army, check out our Requirements for Enlistment.
Basic Combat Training (BCT) and Advanced Individual Training (AIT) in the Reserve is the same as it is for those who enlist in the active duty Army. For more details on what you can expect in BCT see this page.
Not all MOSs are available for the Army Reserve, to see if the MOS you're interested in is available, you can look on the Army Reserve website.