The terms touring kayak and sea kayak are often used interchangeably and usually indicate that the thing is more capable and sea worthy than a rec boat or pond kayak. You will likely encounter enormous sea kayaks and compact touring kayaks, but usually it's the other way around. Most kayakers who have been through a succession of different boats and who aren't camping with them will usually end up with something that is relatively compact and close-fitting. You really want a boat that fits you well enough so that when you move, it moves. Kayaks are best controlled with good paddle technique and body english. If your boat is too wide it can be difficult to edge and/or control in rougher water. If it's too long, it'll be heavier, difficult to turn or control in the wind and yes, more work to propel. If it's too voluminous, it will be difficult to learn more advanced handling skills, especially rolling. In my opinion, most average sized women who aren't inclined towards racing would best be served by a boat 14-17 ft. long and not much wider than 22 inches or so. You definitely don't want be learning in something that is scary unstable, but a "little tippy" you will usually get used to pretty quickly. Avoid spending a ton of dough the first time around, there's lots to learn and what might be perfect for now, you will likely grow out of once you figure out what is working for you and what isn't with the first boat. Few people get it right the first time. Try as many boats as you can before settling on the right one (Cedar Lake or the upcoming picnic are especially good for this). I would recommend buying a good quality used boat, if you maintain it well, you can often sell it for close to what you paid for it when you're ready to upgrade.