Some suggestions for basic stock items:
1) tools: round nose plyers (for making loops in headpins); chain nose plyers (for bending wire); flush cutters (for trimming headpins). I also recommend carrying those new bead-crimping pliers. These four tools, along with very sharp scissors, are my primary jewelry-making tools. You can start off offering the inexpensive ones that retail for around Ů-9 each, then offer nicer ones as your clientele grows more demanding.
2) beads: that will depend on your target audience. You'll probably want a little something for everyone, but younger folks are into the leather cords and macrame string with more ethnic looking beads (trade beads and inexpensive beads from China & India) while women who are in their 30's & up seem to gravitate to either seed-beading techniques or jewelry-making with what I call "bigger-than-seed-beads"--larger than 4o size beads. There's some overlap, but in general, people who are into beading with seed beads demand a whole nother bead inventory (including a huge inventory of colors & styles of beads) than the folks for make jewelry with larger beads.
Also, I've found that people very new to jewelry-making like those inexpensive and gaudy beads from India and China, but people who have been making jewelry for awhile like a wide range of European glass beads (especially the Czech pressed-glass beads & Swarovski crystals).
As far as how to sell beads, I love stores that have bajillions of beads set out in old printers' type-trays, all arranged by color and material--it is so appealing! But I think it will also drive you crazy dealing with people that want to buy 3 ten cent beads, 7 two cent beads, 50 five cent beads, etc. To force higher purchases, you may want to consider bagging beads in lots of 10, 50 or even 100, and offer a good selection of stranded beads. By offering a better per-bead price on these, you can encourage people to spend more $$. Also, I'm sure it cuts down on shoplifting.
I make and wholesale my jewelry to stores across the country, and I mail-order most of my stock, But even though I don't buy most of my stock retail, I still try to patronize the bead stores in my area when I can. It's nice to know I can get to a bead store in my town when I need an emergency supply. So I appreciate any deals they offer me on bulk-buying and frequent purchases.
3) findings, supplies, etc.
It's nice to offer inexpensive base metal findings, but if you want to educate and "grow" your market, it's also nice to start teaching people the value of sterling, gold-filled and perhaps even real gold findings. Also, I have learned the hard way to mostly rely on American-made findings. They cost more, but the quality is worth it. Findings take a lot of abuse, and it's frustrating to have to redo an entire necklace because the clasp broke--or have the necklace break and lose the beads!
4) classes: The best way to grow a bead audience is to offer lots of classes, workshops, bead trunk shows and lectures on jewelry-making, beads, etc. People who come often end up buying more stuff, too! :^)
Okay, I've run out of time, but hope this is enough to get you thinking.
hth,
Luann