OK so unless it states Veg tan than it is not; am I correct to assume this?
Eh, not really. Unfortunately some sellers don't necessarily specify, and I think that comes down to them assuming that you know what you're looking for. They may say "harness" or "tooling" or other descriptors, but mean veg tanned as well. There are a lot of words in leatherwork that mean the same thing, or include traits encompassed by a single term. It can be quite confusing!
Tools are the same way. A "beveler", for example, can mean totally different things, do totally different jobs. A skiver can be an inexpensive hand tool or a powered piece of equipment costing over a thousand dollars.
There are some very good youtube videos that cover the basics of both leather and tools.
Maybe I'll start a leather and tools thread that can be added to (and likely corrected as needed). I started a resources thread a few months ago but we weren't sure if it was in agreement with the forum rules, so never went anywhere. Unfortunate because I think it would be helpful for new craftsmen.
Druid gave you some cool info there. Sorry for not being more clear. Hermann Oak and Wicket & Craig are generally recognized as two of the best tanneries selling leather. They are both US based. That said, there are excellent leathers coming from other places. Some Mexican leather is very very good, and I believe there are leathers that come from one place (South America as I understand it) and tanned here that are also excellent. I know from reading others experiences, from craftsman with many years experience, that quality can change from decade to decade, year to year, and even hide to hide. The big names try to stay very consistent, but they are dealing with living tissue that changes depending on things they don't necessarily have control over, such as drought.
The gentlemen here have been my best resource for information and advice. We all do similar things (for the most part) and have similar goals. That said, leatherworker.net has some good threads that cover a lot of information, especially in their sections for people just starting out. I've seen a couple of familiar faces there, but this forum remains my best resource.