I was asked what do I use for my sketches on location.
I use a soft pouch to put these items in. I have also pencils and such in there like some charcoal and sanguine pencils from Derwent.
But this is basically what I've been using lately:
2 mechanical Pentel pencils one for B ,one for 2B
I like them because you don't have to sharpen them.
Factis - extra soft eraser
Zig millennium ink pen 01 I use mostly this one.
Zig millennium ink pen 05
Tombow light gray N95
Tombow dark gray N55
Tombow light blue 451
I like the sketchbooks from Dailer Rowney with the hard cover so it can give you support when you use it.
The size I use is 8.5 x 11 I like a bit bigger then what I need it for just in case.
The watercolors I've had for about 20 years but did not use them much but now I am rediscovering them, from "Schmincke" it is a metal box and when opened it serves as a palette to mix your colors on.
I use a very small spray bottle from Sally's Beauty supplies that I fill with water and spray what I need on the metal palette side of the watercolor box.
I hope this helps and the only thing I can add is go out there and have fun. Take a ipod of sort to listen to music you like when your doing this. It can make a nice experience even more wonderful.