Hey Pastor,
JMR is right. Jantz is good. Admrial Steel (a lot of choices, but high on some stuff, cheaper on other), Texasknife.com (Texas Knifemakers Supply online...pretty good selection and competitively priced), flatground.com (not a lot of choices, but good prices on some stuff), onlinemetals.com (pretty good selections of all kinds of metal including knife grade STEEL Karl and competitively priced on most of it)...the list goes on and on. Some ship right away some will jerk you around a little. It's just like anything else. Look around, compare prices, shipping promise dates and you'll be ok.
Are you planing on trying to home heat treat Pastor? And are you going to try and forge your blades? Because, being an admitted novice, it will effect which steel you should probably start with.
You can't get my favorite steels W1 and W2 in flat bar any more, but you can get it in round bar. If you are forging. round bar is fine. And it's a very dependable, simple water quench steel. Very easy to heat treat and quench safely. About everything else requires a heated oil for a novice to quench safely.
Then there is the fact that some grades of steel respond better to a rookies hammer than others. I think Karl uses a 5160 mostly for his amazing blades because it's a great blade steel, but I wouldn't recommend it for the novice forger or stock removal maker. It can be tricky to treat at home properly because of strict temp requirements, especially if your not forging. It needs several heating and cooling cycles to get the steel's grain to grow right. Kind of tough for the rookie.
As Karl pointed out, there is a lot that can go into making even a decent blade beyond just good steel.
If you plan on paying the 8-10 bucks per blade to have them heat treated...never mind!? You can use about anything, cause heat treat will be somebody else's headache. ;~0
If your planing on home heat treat or forging...we need to talk bout this a mite! ;~)