Gunslinger Build (Lv. 10-200)

i was thinking today, which skills i would get with my 1st 3 points as corsair, and i was wondering about these sets of skills:

1 boost 1 BS 1 torpedo - how effective is training with 1 BS 1 torpedo? (BS should have almost no HP..)
1 boost 1 BS 1 octopi - is octopi really useful for anything? it's like an extra attack or two and having another octo out. the problem is, it will only last for a couple of levels, or i didn't know and you un-mount to octo from time to time.
1 boost 1 octopi 1 air strike - same question on octopi, and is air strike useful when training with BS and cannon\level 1 torp
(in here see also boost\BS\AS)
1 boost, 1 doesn't matter, 1 rapid fire - dojo build. rapid fire level 1 to go far in the dojo and get black belt. or if dojo training (pap, mu gong?) is effective.

long story short: how useful are octopi 1, air strike 1, rapid fire 1 and BS\torp combo.

rapid fire 1 is not useful, Burst fire does more damage, Torp 1 is not useful it only hits 3(or was it 2) for meh damage, octopi 1 i would assume is prety useless in trainingand bossing>.>, air strike kinda fails @ all levels from what ive seen from 1-15 but ya lvl 1 is prety bad its more of a fun skill, 1 bs is prety much needed tho, if youre good with ice u wont lose it that much buttt all skills kinda suck @ lvl 1 >.> even cannon, from what i saw, you need 2-3 lvl's of .. lvling to get to be a true corsair, cause you will just end up using burst fire anyways