There's no guide because the traditions are all very miniscule and will make no difference in the long run. Just read their descriptions and decide if they're going to impact you in any way given how you want to play the game. Some relate to tradeskills - if you have no desire to do tradeskilling then you can obviously skip those. Some add to your power pool or health pool or regen - those are useful, but by a miniscule amount. Some might increase your movement speed while stealthed - useless unless you group with someone that can stealth you or you use stealth potions - very situational and might be used 0.001% of your overal lifetime play as a SK. Etc.
The most important ones for an Arasai you're given at the top line. Glide, Windwalker, and your innate featherfall.
The 9 you choose between level 10 and 90 are up to you. You can't choose wrong if you read their benefits, really.