IMO..Paddle length is very important.
This is from the Starboard site about paddle length...
"A good rule of thumb for finding the ideal paddle length: have the shaft length equal to the distance from your toes to your eyes."
Remember this is just the shaft length..not the total length.
I think they are probably right...and the latest how to SUP dvd says it should be between 10" and 12" more than your height.
BTW...Mine is 13" above my height...and I'm 6'4"...Remember you can always cut more off but you can't add more on..So start on the longer side.
I've cut down cheap paddle blades to different shapes and found the one on the right works best...(see pic bellow)
This shape allows you to get the paddle more under the board..and if there is any board banging it's the paddle shaft..not the blade...and also the closer you can paddle to the edge of the board the less the board will drift off line.
Good luck with it and have fun...and let us know who you go.
Oh yeah....One more thing.
Wallies (windsurfers) make great learning SUP boards..as long as it's just flat water.
Try and surf waves on them and you will be very dissapointed..When you dip a rail to turn..they will turn the opposite way..and you fall in..
DJ