Some of these questions remain unanswered. But that's fine, because life would be boring if all these questions had already been solved.
The evidence, on the other hand, in favour of evolution is not difficult to produce. The problem there, really, is that critics of evolution do insist on changing what it is they are looking for, or are demanding evidence that isn't even necessary even if it were obtainable. Or, perhaps, they request some demonstration of the fabled "missing link" between one species and its supposed ancestor, and when such a specimen is produced they then demand the missing *links* in the two gaps that are thus created!
At the current point evolution is well-established, both in terms of the mechanism (namely, genetic mutations driven by external pressures) and in terms of how it played out over our planet's history. There remain serious question-marks and puzzles, to be sure, but that is how Science should be.