Congratulations on you new tractor.
As a Member of the winning "Team", and a GC2310 owner, I would like to make the following recommendations:
Yes, a 15" bucket might not be a bad choice, If you have mucky ground. It will empty easier.
Most of the posts in respect to trailer size recommend minimum 14' preferred 16'.
Make sure you are insured, before you take the tractor off your property. Most people find out the hard way they are not.
Systematically check the machine front to back soon after delivery, pay particular attention to the grease fittings. Painted over fittings that do not accept grease, and fittings missed all together, are a common complaint. Spend the extra couple of bucks for synthetic grease.
Start talking at $50/hr, (this is still cheap).
Let us know in the MF Forum if you have any questions, and when you get close to your 50hrs. service for further advice.