Well, the Tomahawk is a excellent ball for spinners...
Other balls include, Crush/r, Ultra C, Ninja Fury, Ninja
Master.
Of cos, if u are talking about a good ball to use as a 1st ball for
training, the white dot is the way to go.
Packages are good, then again it depends on where u buy it. Dun go
AMK Pro-shop cos they know nuts and keep trying to push their old
stock to u, drilling sucks too. 
Do get someone experienced with the style and has a good average to
teach u cos this style is very prone to injuries, therefore, u need
to have someone to guide u. 
When u begin, my advise is not to try and achieve lots of spin but
to train ur footsteps timing and accuracy, the basis of all gd
bowlers is to have a stable and comfortable timing then building
the rest of ur game will be easier.
Take care and have fun!!!
