1) Inspiration:
This can come from any sort of place like your head, internet or from an everyday thing.
2) A notebook:
Because this will be the ideal thing to use when your jotting ideas down.
3) A cellphone:
Because now since we are in the age of technology the majority of the phones have elther a post it app or a notebook app and this is good because since you are all the time on the go then you don't have to take your notebook with you same applies if your writing a poem.
4) Ideas:
This works like a double- edge sword because they can come from your head and from the internet.