Weaving a Header:
(Note, before you do this, if you do NOT have a bottom spring kit, you need to weave one thread through, using the shedding device, and tie that thread onto each side bar. This will act to prevent your weaving from slipping down the loom.)
A header is woven before you start your piece to provide a strong base that will eventually be folded over during the finishing process. Weave your header with the same C-Lon cord (or other warp material) that you used to warp your loom. It should be between 1/3 and 1/2 of an inch of weaving.
Once the shedding device is put on the loom, just engage the shedding device (the shedding device raises half the warps) and place your weft between those warps. (When you are doing this, make sure your weft ends face the back of the piece, this can be accomplished either by wrapping your end around so it faces back or by starting your weft in the middle of the piece.) Then, change the shed by moving the shedding device into the other position (and therefore raising the other half of the warps) and weave through again.
There are many different tapestry techniques you can use when weaving a cuff, but if you are a beginner you may want to just begin with straight lines. One of the difficult things about weaving tapestry is that there is a tendency to "pull in", which means you pull your edges in too tight making the edges (or "selvages") of the piece not straight. This piece makes keeping your selvages straight easy, both because it is thin and because the rows of beads help space the piece.
Beginning to Weave:
Next, (making sure you remembered to change sheds) place the beads on the silk between the spaces in the warp threads. They should fit exactly (this is why it is important to have the ten dent spring... spacing matters a lot when you are using beads in tapestry). Then, continue weaving with the same thread.