Another Of Those "Using Miles" Questions

A cunning plan is in development hereabouts to celebrate a signficant year in our family come 2008. Naturally this involves a trip on VS and if anyone can find the time to assist me with pointers at this early stage I'd be grateful.
This is the scenario. I'm looking to sort a trip out to the US, for the four of us, summer or possibly Christmas 2008. Has to be school holiday time as the local authority doesn't look kindly on headteachers taking holidays during term time. It would be a PE round trip, looking to upgrade to UC on the way out to take advantage of the LHR Clubhouse. It would probably to out to LAX and back from SFO (or vice versa) I have about 69k airmiles myself, and two others in the family have just over 20k each, one other about 15k. My balance may go up (depending on work), or I might opt to buy miles.
Questions therefore:
1. I presume I should start scouting the fares a year in advance ? Is that when they are released ? I am assuming that because it's peak I am not going to see any offers and will have to pay the going rate.
2. Given the timings (i.e. peak period) is it worth even looking for for reward availability for four seats or is it simply a lost cause on the routes I've been considering?
3. If I book the fares and upgrade myself and the one family member who doesn't have enough miles can the other two use their miles to upgrade even though I've booked the tickets for them ?
4. Looking at using the total portfolio of miles across us all, could the one whom I use miles to upgrade use their miles (about 15000) to book a limo (or would that have to be me ?)
This is well in advance but any pointers gratefully received even if they take the form "RTFM" (as long as you tell me where "TFM" is)..
Paul
This is the scenario. I'm looking to sort a trip out to the US, for the four of us, summer or possibly Christmas 2008. Has to be school holiday time as the local authority doesn't look kindly on headteachers taking holidays during term time. It would be a PE round trip, looking to upgrade to UC on the way out to take advantage of the LHR Clubhouse. It would probably to out to LAX and back from SFO (or vice versa) I have about 69k airmiles myself, and two others in the family have just over 20k each, one other about 15k. My balance may go up (depending on work), or I might opt to buy miles.
Questions therefore:
1. I presume I should start scouting the fares a year in advance ? Is that when they are released ? I am assuming that because it's peak I am not going to see any offers and will have to pay the going rate.
2. Given the timings (i.e. peak period) is it worth even looking for for reward availability for four seats or is it simply a lost cause on the routes I've been considering?
3. If I book the fares and upgrade myself and the one family member who doesn't have enough miles can the other two use their miles to upgrade even though I've booked the tickets for them ?
4. Looking at using the total portfolio of miles across us all, could the one whom I use miles to upgrade use their miles (about 15000) to book a limo (or would that have to be me ?)
This is well in advance but any pointers gratefully received even if they take the form "RTFM" (as long as you tell me where "TFM" is)..
Paul