If yr intimidated by the sphere grid, then just use the basic grid and follow the default paths. You will get a fairly balanced party and not have to worry until you reach the level 3 locks. The only decision concerns Kimahri who has no default. I would strongly reccommend guiding him to the thief path as at least he won't be slow and may do some good. You need to wait until you have level one keys (bloke on high road and in Rin's first inn will do it).