Grit 4000/8000 and that’s it? Brand new to this using the razor today. Thank you!

If you have a quality razor without damage those grits should be fine to shave off of.  If you need to set the bevel and not just polish a 1K stone will be much faster.  If these are water stone (which im guessing they are) you NEED a method of flattening the stones periodically and perhaps the first time you use them depending on the quality of the stone.  You can flatten your waterstones with either a diamond plate or sandpaper mounted on glass.  I shaved for quite awhile using just a Belgian coticle, which is probably around 8k grit.  I have several Japanese stones which produce nice shaves, but are very expensive and harder to find.  You can mess around with diamond pastes on an old strop too.  Occasionally I will use such a strop to extend the time between honing.