what kind and length of leash?

is wearing a longer leash safer even if you have a small board?
is double swivel realy useful?
I have a short board and will try to learn surfing on it
I will start on small sand bottom waves, what leash is the safest for me?
Should i worry about buying a very strong leash for small waves?
is double swivel realy useful?
I have a short board and will try to learn surfing on it
I will start on small sand bottom waves, what leash is the safest for me?
Should i worry about buying a very strong leash for small waves?