The general rule is that crosses should be started at the top and end at the throat. This puts less strain on the racquet. To do this you should use the 2 piece technique.
On your Pro Staff, if you do a one piece techique, you should consider the Around The World technique for the safety of the racquet since the mains end on the throat.
A lot of beginners, start with one piece stringing, thinking it is easier because you have only 2 knots. You will find out 2 piece is actually easier because you don't have to handle the long length of string so often. I find 2 piece to actually be quicker now.
I'm not so sure why so many people are recommending the two piece so much. I actually prefer a two piece in general, but I don't think this is necessarily the right recommendation for someone that is (relatively) new to stringing. A straight one piece pattern has less that can go wrong with it if you are just starting out, IMHO. I also don't think it is wise to recommend an ATW pattern to a new stringer, either. Especially over text on a message board. If i was just starting out, I wouldn't even know where to begin if i had to string the ATW. Instructions are very difficult to follow if you don't know your way around a machine and/or patterns (which is almost safe to assume).
The long length of string handling is simple: keep the tip in a place where it's easy to find (i bite my string end). You don't need to manage anything else. If i were stringing based purely on speed, i'd probably stick with the one piece, it has more potential to be faster.
Note: If you keep track of your string end by biting it, or curling it up using your pinky, etc, you cut ALL the time you waste by searching for it over and over again. This can cut ~5 minutes off a string job, assuming you take 10-20 seconds trying to find the end every time. The handling of the long side is only more of a hassle because you have to draw it through a hole, which might take what, like 2-5 seconds? I find the knot tying procedure a much more time consuming process, especially if you are tying different knots (lets say 3 double half hitches and a proper starting knot)
I should mention that I also prelace my mains, it's messy, but i can keep track of everything no prob.
Also, even though the one piece bottom to top is less "safe" (theretically, although i agree) for a racquet, wilson has no problem with it from a warranty standpoint and otherwise. It's better
practice to string from top to bottom, but in this case i'd just let it go.
This isn't to say i'm lenient on "following rules," as I personally practice good technique, but you guys expect a lot from inexperienced stringers.
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