Search for "beginner" on this sub. There's tons of answers that have been given. If something has a lot of upvotes, maybe it's a good one to consider. If it is downvoted, it might be best to look elsewhere.
The sidebar, sadly neglected, has a lot of information put together by people who know what the hell they're talking about, including info on tools, stitching, and literature.
Between a search and the sidebar, you have more answers to your questions than you can read in a day.
Do you want to devote time to learning, or have things handed to you? Try not to be one of those people that have a logo and stamp made for their "leatherwork business" before they can stitch a semi-straight line that looks halfway decent. If that's the route you want to take, make sure you are up on your photography/marketing and have the PNW hipster persona down. Flannel and brass BAYBEE.