File down any sharp edges on the bike, such as the edges of the stem or handlebars. Dirt jumpers can usually get away with just throwing some pegs on their bikes, vert riders can usually run their bikes as they are, and a flatlander who also wants to really focus on the street might consider using a longer frame and higher gearing. Choose all the parts on your bike based on their strength. If you are set on grinding on only one side, you really only need pegs on that side, but that may limit your creativity later. When you are setting up your brake cables, make them as short as possible while still having smooth braking.
Long cables tend to get in the way.
Most riders use smooth pegs for easier grinds and other lip tricks. Gearing preferences vary from person to person. BMX freestyle is an inherently dangerous activity that can result in serious injury or death. We recommend that you seek proper training and equipment before attempting this activity. Inc. How things get done.