I've been doing this for awhile. I only need a little bit of stuff on my "brain" because we have a lot of stuff in our MR that I can refer to as well. The whole patient hx is entered into a database we can refer to at the touch of a button so I usually don't write down the hx. On my brain (I use a 1/2 sheet of paper)
Patient name, MR number
surgery, POD #, complications
drips and current rates
Then I write down times. My facility is a little weird in that all our stuff is done on the odd hour, so I write down, top to bottom 09,11,13,15,17,19. I write down under each time the timed stuff I have due, e.g. if I have meds due, I write "meds" under 09, 13, 17 or whatever it is. If I have an IV med due, I write "IV." Treatments, I write down "dressing change". "Labs". "Trach care." "Assessment." Whatever it is. This gets updated throughout the day. If I have stat or now stuff to do, I'll find room on the sheet and write it down with a little box next to it, and check off the box when it's done (I do this for a lot of paperwork type stuff as well, like "care plan", or whatever.)
The longer you do it, the less you'll need. I no longer need to write down my own assessment or VS on my paper or what I got on assessment/VS from the previous shift. I remember it in my head, and it gets charted in the medical record anyway. I know some people insist on writing down their whole assessment in sections: CV, resp, GI, etc... I don't need to do that anymore. I've can also remember stuff like the vent settings, the rate the TF is going at and what formula it is, etc. without needing to write it down, but if you can't yet, I would recommend throwing that on your brain for your own reference. I would NEVER go without a brain though -- I know some people do, but I would forget something for sure or something would be late. I need some method to check stuff off.
I don't know of anyone with any significant experience that uses a tool that they haven't made themselves. I think eventually you will figure out what you need from a "brain" format and make your own, whether it's hand-written out every shift (like mine) or if you put together a photocopied thing of your own design.