Hi and welcome to the forum.
Please do some research and start narrowing down your questions. For example, what Rolex or Pam model? Once you figure out a model, what version? Once you figure out what version, modern or vintage? See what I mean. Both companies have produced hundreds of models over the years and many have been repped. You will get flamed if you do not do your own home work and footwork. Takes much reading/research just to get started.
For example if you are after a Rolex Submariner, think about how many models and variations that have been produced of the Submariner over the 60+ years they have been in production....
So after research you decide you like the modern 116610 with LN (black) insert, then you would have a starting point. Or maybe you are a vintage guy and like a mid 60's 5513 and that is your starting point. Then you might get some help on what direction to go from there.