One of your first investments will need to be a means of frequently sharpening your new turning tools. As you may already know, turning tools must be sharpened fairly frequently. Your tools are not pre-sharpened in most cases, so sharpening is necessary before their use if you want them to work the way they should. Dull tools cause new turners great frustration.
Also, safety equipment such as a good dust mask and a full face shield is a must. That face shield may come in handy, especially when you try to learn to use the skews!
Craft Supplies USA is a great source for turning tools, equipment and wood. I've found their wood to be reasonably priced and of great quality. Penn State Industries sells wood too, but I've never bought from them. Buying wood at Woodcraft tends to be much more expensive than it needs to be. Gilmer Wood Company has some amazing wood when you want to spend the big bucks....That site is worth a look! I buy some wood on ebay, but you have to be careful regarding quality and moisture content. West Penn Hardwoods is where a lot of Woodcraft's wood comes from, and they're a good source. Whatever you buy, be sure that you understand that turning wood is often sold "green"...Undried. So it is not necessarily ready to use.