To be honest, it seems a bit pricey for all that it includes. Not to knock a good store.
You can buy the best brushes in the world, but without any hands-on experience, you might fail miserably. A good letterer can even make a brush from Michael's sing.
I would suggest going to a Pinhead meet, or a Walldog event, and getting busy painting. Then you can see which type of brush works best for you. In lieu of that, you may want to attend one of the lettering classes that Mike Meyer or Pierre Tardif teaches, or Wayne Osbourne in the UK.
Once you know which brush best suits your needs, buy a few. I prefer the metal ferruled brushes from Handover's or Wright's of Lymm. I did start with plain old Luco quills almost 30 years ago, but before that I used craft store brushes.
Get some brushes, and most places who sell those will sell (or give) you a fancy box to keep them in. Don't forget the turpentine and the baby oil too. You might want to check out Mack Brush Co., Quill, Hair, and Ferrule or Coastal Airbrush as well.
Love....Jill
PS
I only use Ronan paint.