Harven is right. You should test the game without addons to get used to it, at least for a while.
Maybe one addon that does not change too much but wil increases the comfort during gameplay.
I can warmly recommend you "
AdvancedFilters" or "
FilterIt".
They both do pretty the same, but FilterIt got some more options that might confuse you.
It will give you the possibility to organize your inventories (palyer, bank, guild bank) better.