welcome with your new toy.
without photos im guess, but it appears you have an early "enameled" model. they are prone to chipping. its just the nature of the finish.
imo, trying to touchup a gun is a waste of time, energy and money. But its also your toy to do as you please. Unless you plan to touchup and put away or hang on a wall it will probably bet more chips/dings along the way. Hence the waste of time & money.
And depending on where you live and your ideas on guns, you may want to consider having it refinished to one of the many more robust/durable finishes out there.
You can google for them if you want, or if you live near any guns shows check them out since some vendors/refinisherrs will display their wears there and you can touch/feel/examine/inquire about the product they endorse.
And i get you maybe wanting to keep it OEM, but again, future wear/dings and the continual process of touchup. depending on how long you want to keep up the chase, you may end up with more touchup than OEM finish.
Also, i havent seen any good touchup jobs, but it will look like its been touched up.
good luck