[COLOR=black][FONT=Verdana]Hopefully I can help with both accounts.[/FONT][/COLOR]
[COLOR=black][FONT=Verdana]When drafting, work with smaller bits of fiber at a time, drafting the fiber to the diameter you wish to spin with. A couple of YouTube videos [/FONT][/COLOR]
If you're making chunky yarn, your spindle may indeed be too light. I found a nifty gadget at the hardware store that has worked for me (and I just happened to have a couple in my purse and my camera here at work with me) I'm not sure what it is called but I put it under the whorl and it tightens with a rubber hex screw on the side. It gives a bit more weight to the spindle.
When removing your yarn from the spindle, keep it under tension. You may not have enough twist in the yarn either.
Wheels.... very subjective and very personal. The latest issue (summer 2008) of Spin Off has a great article on selecting your first wheel (http://www.interweave.com/spin/spinoff_magazine/)
My first wheel was an Ashford Traveller. A very sturdy, upright wheel. I got the double treadle, double drive with the optional scotch tension. It is a very versatile wheel that has taken me from a beginning spinner to one more advanced. I've had it for 6 years and it has been my main workhorse. I have a couple other wheels (70's era Ashford Traditional that I use for a student wheel, a couple antique wheels that rarely get used).
Recently I purchased a Kromski Sonata. My Traveller was still serving me well, but I needed (wanted) a wheel that I could take with me on airplanes. It is a double treadle, scotch tension. Folds down and fits inside it's own padded bag.
I've had a chance to spin on Louets and Schachts. I wasn't impressed with either myself, BUT I know Louet and Schacht owners that adore their wheels and aren't much impressed with the Ashford or Kromski.
For a wheel that will get you going without spending gobs of money, check out the Babe Wheels by [COLOR=black][FONT=Arial]Nels Wiberg http://www.babesfibergarden.com/ [/FONT][/COLOR]They're not much to look at, but they are great wheels and when you're ready to move on, there is always someone wanting to buy one.[/FONT][/COLOR]