I am also new to tractor ownership and want to echo some of the words of wisdom I see here. I've learned a lot in the year I've had my Kubota 4060.
1. Slow is smooth, smooth is fast. It doesn't take very much to go from in control to in a situation. When filling the bucket, driving along a bumpy road, pulling something, etc. Just remember that the tractor has more power then it needs to get itself in trouble.
2. When you can, always hit a hill head on. Side hilling a tractor is a scary feeling. Your seat-of-pants meter will definitely keep you grounded, but a tractor is much more stable driving up and down a slope then across it.
3. Keep weight low. a load in the front, or rear should always be as close to the ground as prudent. in the event of a issue, you can get that load on the ground quick and usually prevent a accident.
4. Smaller bites usually are better. If you loader is anything like mine, a full scoop of most material (dirt, gravel, rocks, wood) will lighten up the rear end a lot. I live on a very hilly piece of property, so I usually load lighter and make a few more trips.
5. Load your rear tires and hang something heavy off the back. This will not only aid you in traction, but it will give you a lot more confidence in moving material.
6. Slow speeds in snow. I run a front mount snowblower for the winter clearing a half mile dirt road that is full of hills. Low range is my friend. I tried running a higher speed, but control in snow goes right out of the window. keep the speed low and you will keep your traction.
7. don't be afraid to ask question. I've never owned a tractor before, and they are quite a big investment. I cannot tell you how many times I've called my dealer with a dumb question or to get clarification. I apologized to them and he said to not worry about it. Its a lot cheaper to ask about something first, then it is to guess and break something.
Most of all, have fun. with each hour on the machine you will learn more and more. the first ding is the hardest, but these are tough machines that will give you plenty of use as long as you maintain them.
Good luck and keep all four planted!
Joe