Can anybody help with this booking.

Man - lhr - bmi
lhr - lax - nz biz
lax - las - ua econ

las - lax - ua econ
lax - mun - luft biz
mun - man - luft biz

1. How many miles and cash
2. What happens if i have to cancel flight. Would i get a refund.
3. What is the policy on name changes.