The Create-A-Character stuff at the beginning is the same as the GOAT was in FO3.
Depending on what and how you react to the line of questioning
There's no sprint button but if you up your Agility rating, you can make you character move faster.
HOWEVER, there's the shit-ton of deciding factors that make you slower...
Crippled Leg(s), overpacking gear, using a two-handed/heavy weapon.