Yes to all of what Inky said! 

Also, some more stuff: You most CERTAINLY can use whatever type of journal you like. Blank, lined, grid, dot grid, they'll all work. A lot of bullet journal-ers like to use dot-grids, which is what I use. If you want to go in that direction, I recommend Lemome and Scribbles that Matter brands (although there are many other great brands, too). I use a Lemome, and it's great. It has two bookmarks, an elastic thingy (idk what you call those...XP), a pen holder on the side, thick cream-colored pages, a pocket in the back, and lays flat. The one I got also comes with some free stuff (mini ruler, stickers, pen, and tattoos [Those confused me, since they have nothing to do with journaling, but they were free, so...XD]). The Scribbles that Matter journal is pretty similar, minus the free stuff. I haven't tried it myself, but the reviews sing it's praises. You can get both of these and lots of other journals online (I ordered mine off of Amazon), but I'm sure you could find a great journal at Walmart or Target, or Dollar Tree, too. Hope this helps!