You can read all the debate about what oil to use here in the forums.
Mostly it depends on what you expect, and how much you want to spend.
Napa Gold filters are good, Frams are fair. I can't speak for much else. As long as you replace it regularly, It should not be a problem, ever.
Oil brand.....that's a huge debate, but weigh your piece of mind and brand loyalty against the value of your car. That's all there is to it. For all we know, the oils are all the same and the manufacturers are making all the money off marketing and name recognition.
You do not need to do anything before hand to change to synthetic oils.
If you want, check out
Auto-Rx. It is an oil additive that cleans your engine. I have heard many good thing about it. With your mileage, it can't hurt.