Do I go digital or stay with a bill book?

Hi all,

GF has asked me to take over her money management. I have only 3 or 4 bills and I manage it without effort.. But she has alot more debts to manage. She is not in debt significantly.. Just house.. Car.. Kid bills.. A few cards.

Her previous method was to not pay attention cause she always made a significant amount of money and still does. But she has some big expenses she is going to have soon (she has the cash) but was feeling very unsure of her cash position. She knows she does not pay attn the money so I volunteered.

In the past.. Long past.. When I had lots of debt.. I kept a bill book.. And wrote down every bill and etc.. Made a nice tangible thing to look at and plan with.

Do I go digital or stay with paper? Any pre-made excel sheets out there?