Seeing as though I am home early, weather shut us down yet again.
Frit choices are made by application: high gloss, satin, matte, some for lower fire use, some higher, some boron based, others higher alumina. Application determines frit choice: to start out: 3110 and 3124 will get you going across a broad range.
EPK is the common kaolin used, OM4 ball clay is also popular; I prefer New Zealand Kaolin.
Chemicals: Mahavir or Custer for potassium feldspar; KonaF3 (minspar) for blended, and Nep Sy for sodium feldspar. Custer is iffy.
325m silica for all glazes, 200 m silica if you are doing high fire in specific applications. (or clay bodies).
Dolomite for calcium and magnesium, and talc for magnesium
Lithium carb for straight lithium additions, or spodumene and petalite for lithium feldspar.
Gerstley borate ( or equal ) for boron based glazes/ lower melt temps
Alumina Hydrate ( needed in rare instances).... 1/4lb is plenty.
Bentonite... glaze viscosity.... 1/4lb is plenty to start.
Whiting... calcium source.
Copper carb. cobalt carb, red iron ox... will give you plenty of color to start... with some choice stains.
This short list will get you well down the road and give you a working glaze base.