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I'm so glad this was helpful to you! Congrats on fixing the dress on your own!
For the smaller beads you need to use a beading needle, which are thinner than standard sewing needle. To get through leather, you want a shorter beading needle to reduce the risk of bending the needle going through leather.
Hi, it depends on the amount of Wonderflex used and what is used underneath, but the plastic itself would probably weigh 1-2 pounds.
To finish the back, you take a few small stitches and/or make a half-knot by making a stitch, then putting the needle through the loop before tightening. Do this a couple of times for security. This is the same technique used to finish any hand-stitching.