why January? It is very cold to be pruning anything.
I'd leave a foot of the main branches above the ground.
What zone are you in Carol? Find out here:
Here are some rose pruning tips:
I am in zone 9 and prune in late January to early February and have my first blooms by Easter.
Mine are still blooming . . . Even more opened up today.
Depends if they are climbing or bush roses. I would consult your local greenhouse garden center. Great books and advice about everything there.