Life is tricky to define, but the most likely scenario is life does not develop first - it develops only after a process of evolution of replicating stuff that would not be considered alive by most definitions.

Eventually, after billions of years with trillions of petri dishes worth of different little evolution experiments all happening in parallel on each of billions of planets, some of them gain replication mechanisms that are complex enough that they could be considered alive.

Evolution leads up to this point, and continues after it.