Some scans or picutes would help us identify the type and signature of your notes for a more accurate estimate.
If yout notes are 1954 Devils Face the values are as follows
$5 note = $2200
$10 note = $2200
$20 note = $2200
If yout notes are 1954 Modified type the values are as follows
$5 note = $1050
$10 note = $1050
$20 note = $1100
I myself would love to see scans of these notes. I will be looking to answernig your questions.
Cheers