- Once you have your first Reaper out, move up to your opponents base to find out what they intend on doing. Also harass as much as possible
- If you see a fast expand in the works, you can begin massing Reapers and prepare for a Reaper / SCV push
- If they seem to be playing off of one base, you have the option of massing Marauders as well as Reapers, or teching up if need be
NOTE: Build orders should never stay static and are subject to change based on what your opponent is doing! Remember this is an RTS: use your brain, be adaptable, profit.