need help pairing up my apple watch

Without knowing anything else, perhaps this article will help:

Set up your Apple Watch - Apple Support

If not, can you describe where you are having problems?

What model of phone is it and what version of ios is it running?

What model of watch is it and what version of WatchOS is it running?.

What troubleshooting steps have you tried?.

What errror messages are you receiving?.

Has this watch ever been paired to another phone?