Re: How fast should it go
Take into account the other things that help get a boat on plane.
~ Hull growth - I would assume it's trailered? The hull is clean, free of debris and waxed?
~ Prop - Already mentioned to death. You prop should be able to get to the middle of the range of WOT. Figure roughly 5000-5300 RPM.
~ Trim tabs - Is your boat equipped with trim tabs? If not, look into it. They are relatively inexpensive and are one of the best modifications you can make to your boat.
~ Engine trim - When starting off, I always found it best to put the drive all the way down to it's limit, then bump it up for 1 seceond (so it doesn't send vibration and noise through the hull).
Additional things would also be the amount of load, dispacement of load in the boat (the other 3 adults all the way to the back of the boat wil have a significant impact on getting the boat out of the water), engine tuning, etc.