I know how they stay in orbit but how do random planets and stuff have the exact speed needed to get to orbit? Is it pure chance or some phenomenon that speds them up or slows them down?
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Random chance does indeed play heavily into planetary system formation. It is basically survivor bias where we only see the material that randomly ended up in a stable orbit but can not see the huge amount of material which were either flung into the Sun or out into far space. Any planetoid which was not in a stable circular orbit would likely end up crashing with another object changing its orbit or at least get pulled out of orbit by these other objects.
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