Welcome, ok suppliers first
Le Prevo
Tandy uk
Will do for know they are who i use, le prevo first as tandy can be a little expensive and you gotta have a credit card, I have some leather collar blanks if you want a couple for a starter, if you do you can pm me. I was given them by my mentor who has imposed on me the curious affliction of wanting to help others. You will need to buy the furniture/hardware. I would recommend looking up saddle stitch in the forum or on the net. The collar blanks are however nearly together, just need stitching. If you want sude backing you will have to sort that yourself as I have run out for the moment.
IMHO You will need a stitch groover, an awl, some waxed thread, a ruler (to space the stitching) or a stitching wheel, two saddlers needles, some contact adhesive.
Anything I've forgotton folks?