Depending on your riding style. You should NEVER dull your contact edges (where your ability to stop, turn, carve...ect) comes from unless you know exactly what your doing. Tip and tail detuning is a good idea if your going to be pressing a lot, but unless your an extremely good boarder this probably wont make any bit of difference.
If the mfg. didn't wax the board at the factory then you will want to have the board waxed. This will keep the base moist and sliding well, helping to extend the life and reduce wear. You should wax your board regularaly. If you ride lots of icy conditions and hard pack snow you may want to invest in a tuning kit. Follow the instructions provided or search youtube for legitimate demos, but dont get carried away.