What your trying to do is actually rather simple. If you just wire all the fixtures in series (all the hot wires connected and all the neutral wires connected together). Once you have all the fixtures wired together in series simply wire the new fixtures into the hot and neutral of the existing incandescent light junction box. If your eliminating the incandescent light I'd just find a cover plate for that junction box.
As far as wire type etc. all I can say is stranded wire is much easier to work with than solid core wire. While I'm not sure what the amp draw is for these fixtures, I'd like to think 14 ga. or even 16 ga. wire should be sufficient.
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