Are you wanting to start classical piano, then?
Having a teacher would really help. How much do you know? Do you know the notes on the keyboard already?
To build up finger strength, finger technique etc. the classic choice is by Hannon, I think it's called 'The virtuoso pianist', the only book the guy ever wrote. That's strictly exercises though.
Czerny also wrote a book of exercises for the piano that get progressively harder, it's used pretty commonly.
There's also a series of books called 'Dozen a Day' that starts at the real basics. You probably already have enough of an affinity to music from cello to skip a lot of the easiest stuff.
I've not found nor have I looked for web resources for classical. But IMO, if you have the money, I'd definitely go with lessons.