Lower level solo shamans, which buffs do you keep on you all the time?

[isoka]

SoW is a must have at all time (unless indoor), and then regen when you get it at 24.
Str is useful if you melee and or to carry things around. You can keep agility on, though the return is not that great. I would recommend you to consider casting your stamina buff to increase your total hp.

Regarding Inner Fire, it's only a 20 hp buff, but it stacks with cleric and druid HP buffs. It will be upgraded at level 34 by the Talisman line of spells. But most importantly, it can act as your best healing ratio spell (as long as you don't need to heal a huge amount of hp in short time, and you can cast it in-between two meditate ticks).

Inner Fire : Adds/Heals 20 hp for 10 mana
Light Healing: Heals 33 hp for 25 mana
Healing: Heals 100 hp for 60 mana