Hi!
Wire: Kanthal A1 29 Ga wire (0.3 mm). With this, you will learn to wrap spaced coils, as well as micro coils, and only after that would I move on to Eric Clapton style guitar wires. Zivipf has the best price/value. You can wrap coils with it for MTL around 1-1.5 ohms, and for DL as well.
Cotton: Cotton Bacon Prime (this is a bit denser, harder to work with, but in return, its wicking is NB1-level), or BPmods Pro Cotton (this is softer, easier to work with). Google is your friend regarding sourcing locations.
P.S.: There are no worn-out topics, only uninformed vapers. Ask, and we will answer. 