How can you tell if a Rolex watch is real?

My sister went to China and got me a Rolex watch. The second hand is fast and smooth, no ‘tick’. There is a hologram sticker on the back with a serial number on it. The band has 3 rows of silver, the outer rows are more of a brushed silver, the inner row is shinier. It has the Rolex crown for the #12 on the face, and on the glass there is an etched crown. It is a wind up – no batteries.It is a beautiful watch regardless, just wondering if it’s the real deal or not. If it is real, how do I register the serial number on the back? Thanks in advance all!