1. Its too soon for your flight.
2. Flight is not available in upgrade class. To upgrade now, you would need to use $$
3. You need 50K miles in M&M per person oneway for LAX-MUC. It may be less for UA MP but you need to check with UA for that.
4. Its only a 8 hour flight. Enjoy economy!
5. Yes you are not allowed to ask about selling miles here on this forum.