Don't apoligize for asking questions. That is what we are here for.
But to get all the answers in one place ( besides here ) you should go to this
first like shertz said. Most if not all beginner questions are answered there. If you need specific questions answered, feel free to ask.
So now to answer some.
1 I imagine it will last years like any other beer.
2 Always nice to be safe, so continue to be paranoid ( although I'm not )
3 generally you shouldn't have your fermenter temps over 20c
4 If you haven't proper temerture control like a temperture controlled fridge, then most lagers are out of reach, but you can make some good lager like ales with the right yeast. I use Nottingham and US-05 for dry yeast.