Welcome to the forum,hope you enjoy .
IMO-find out what kind of laquer the shop will be using first.You don't want to accidentally use something that would react.
Personally I've always liked doing the pore filler,just seems to bring out the wood.
Some people don't like to use filler,which is cool.
I like to condition,fill,sanding sealer,(all light coats so I don't choke the woods tone),and then do the stain or colour.
Some people like to stain the wood directly,which does look richer,but I've always done it up a layer or two in case the person decides to change the finish later.But that's just personal opinion.
Either way is cool and I've seen beautiful results both ways.