i would start by defining requirements, then work from there.
for example i would imagine that there is few buttons for the user:
a_score_1, a_score_2, a_score_3, add 1-3 points to team A
b_score_1, b_score_2, b_score_3, add 1-3 points to team B
reset all, clears all counters and displays zeroes,
and probably an undo button or buttons (to wind the score down when points were awarded by accident).
depending how you want it done this (and reset) can be combined into preset logic (preset zero, clears displays; preset nn, displays nn) .
i don't hink i see any decade counter so you may need to adapt binary counter to count 0-9.
7447A is a 7seg decoder, (you do realize you will need multiples of some of the parts?).