what's up Bike Forums,

I just moved back to Minnesota after spending two years skiing on Mt. Hood & have decided to use biking as a means to fill the massive hole left by skiing. There are 85+ miles of trails around me and since I'm not all about riding on the side of roads (cars give me a bad feeling), I've been ripping around getting to know the trail system. I like to go fast and love the ability to hop off & go exploring if I see something worth checking out.
Right now I've got an old Schwinn World Sport my friend & I turned into a single speed a couple years ago... here's the only picture I have:

It's a fun bike because it goes fast, but the front brake is the only brake & it doesn't work so well & I have to control speed using my foot on the back tire, hahaha... I'm hoping to use this forum to help me cobble together a much better bike out of individual components.
Thanks in advance for all the help!