I bought a zipup 2 ring binder from Officeworks (then upgraded to a similar lever arch file as it wasn't big enough) some coloured dividers and some plastic sleeves. Everything went into that so it was both filed and it could be taken with me to appointments if necessary.
I also used to keep a notepad on the kitchen bench and record meds, temps, how I was feeling and any questions. Before each appointment, I would pull out the relevant information and pop it into a word doc - a brief diary, a list of symptoms and whatever questions I had. Onc added these to my file.