Re: Hello Hello!!
Welcome to the forum. Most members recommend using a front brake, no matter what kind of brake you have on the rear.
You can pick up a caliper front brake that will fit your cruiser at a bike shop that sells BMX bikes and parts. Spookytooth and some of the other on-line engine kit supplier also sell them.
“You're only young once, but you can be immature as long as you like" -Unknown