LSmayda, that's lots of questions to try to answer all at once.
<font color=blue>How many hours are they good for?</font color=blue>
Probably no one really knows because most of the modern compacts haven't been around long enough, and most owners don't put a lot of hours per year on one like a big farmer would. And a great deal depends on how it was maintained. Farmer neighbors tell me the big ones "normally" need an engine overhaul between 7,000 and 10,000 hours. If yours was properly maintained, it's not half way to overhaul time yet.
<font color=blue>This unit has a hydrostatic drive and seems to loose power when digging into a pile of sand.</font color=blue>
How familiar are you with the operation of a hydrostatic transmission? Use low range, maybe a little more throttle than you were using (2000-2500 rpm), and remember that the hydro pedal is not an accelerator. As you push farther down on the pedal, it is the equivalent of going to a higher gear; ease down on the pedal going into the pile of sand instead of pushing it down too hard, too fast.
<font color=blue>Living in Florida I question having to use the glow plugs to get a smooth quick start</font color=blue>
I use the glow plugs, even in the summer in Texas; I just don't use them as long as in cooler weather, to get a quick start.
<font color=blue>the hazzards of a front loader</font color=blue>
Very hazardous piece of equipment until you get accustomed to it. Basically, keep the load (weight) centered in the bucket. Do everything very, very slowly. Keep the bucket as low as possible when you have a load in it. Avoid turning as much as possible and/or turn slowly with a load and the higher the load is the greater the danger. If you didn't get a manual with the tractor, contact a dealer and order one. Read it carefully.
Can you tell whether the leak is engine oil, hydraulic oil, or coolant?
And now maybe someone else can continue or add to this.
Good luck, and have fun with the new tractor.
Bird