Oh yeah, you've come to the right place for inspiration and guidance, This is the best leather site on earth.(imho)
In trying to get you situated;
Your idea for a kit, Is what many have started with and its worked out Ok .
Once you come a ways, you can choose your own particular leather, and tools as needed.
Hammering from the kitchen table; May not be as bad as you expected ?
Maybe you might try a tool box mat, or carpet I've heard works ,
They say, Pound-O Boards from Tandy will work under your granite slab for noise elimination ?
There was a thread here, not long ago about this topic. you might do a search here or check the archives.
Your ideas for leather working seem to be well warranted,
I recomend not over thinking anything, although this craft will make you think each step through,
Just have fun, and be happy your here. --------- Wild Bill46 !