Guys, I really need your guidance.

I really want to get into crafting/gathering more so than levelling my other battle classes. (have DRG at 50 and WHM and PLD at 30.)

I currently have a lv35 Botanist and im not even sure of what items to actually STOCK or KEEP. Gathering 20 of each material i could gather on my botanist fills up my 3 retainers. With all this talk about levelling all 3 DoL classes at the same time, how can I manage my inventory? Is there a guide out there that is updated on what items to gather or atleast keep a stock of?

As for crafting (I know that DoH have their own forums but please hear me out, it is related to my concern), How do I go about it as well? is there a guide on which leves to do every 5 levels for efficient levelling?

I just need some guidance. Im really concerned about inventory space.