They're actually very easy to ride...
Pull the clutch in, pedal real fast & 'pop' the clutch out to start it.
You pull the clutch in just before a stop (so the engine can stay running while the bike isn't rolling).
When you take off from a stop, you pedal to build up some speed & gently let out the clutch to engage the engine.
Always pedal the bike at low speeds (or going up a hill) to help the engine.
There's probably some videos on Youtube showing how do do it all.