Assur asked me to talk about Will, today. I'd much rather talk about what a God I was and how I dominated the sands and the throne, but Assur says Will. So...
I have 21 will! 21 will is highly recommended. Will is THE primary stat for endurance, gives hit points, is used for making rolls during the fight (including surviving death), is the primary stat for raising stats later on,and gives useful skills (ATT, DEC, DEF, and PAR). It also plays a lesser role in learning skills, which is primarily based on your wit.
But like many other stats, will has some key breakpoints.
The first key breakpoint is WL=7. Technically, WL=5 is also a breakpoint, but that is a much more advanced topic than what I will cover. WL=7 is the minimum most managers should consider. There is a fairly large gap from 7 to 15 before skills start coming again. The key downside to WL 7 is endurance. Usually, if you're looking at WL=7, you should be looking at the hybrid styles that can deal with low endurance (TP, PS, PR, and AB)
Next, WL=9. You get one decise skill here. That is it. It is better than 7 in all aspects, but the really they both are very low and bad. 9 is less bad. Except for the endurance concern, 7 is perfectly fine for warriors that don't care about that decise skill. For warriors that do care, 9 is perfect (unless you can get to 15). These warriors are mostly the offensive warriors (SL, BA, ST -- though slashers love endurance, so 9 is pretty low for them).
WL=15 is a huge breakpoint. This is where you start getting all four skills again. No skills from 10, 11, 12, 13, or 14. So Assur typically doesn't add points to WL to get to any of those values. 9 or 15.
WL=17 is the next breakpoint, another set of skills and all that other stuff you get from high will.
WL=21 is perfect!!! (At least until you graduate, then you can raise will to 25). Why wouldn't you want as much will as is possible? And WL=21 gives 2 of each of the skills mentioned above except DEC (you only get 1 DEC skill at 21 will)
Good luck!
-- Pets