Reward Flights

I have been saving up miles for a year or so and now have nearly enough for two PE or two upgrades from PE to UC. I am looking for availability to either Dubai in the late autumn or St Lucia or Grenada in Feb/March next year.
I have never booked reward flights before and am finding it a bit confusing! When I enter dates which seem to have an available reward flight according to the matrix, I then get a box up which says I need to call VA direct. Is this normal? Any advice on how to actually find dates when flights are available would be appreciated.
On another point, I also have a Economy to PE upgrade voucher via AMEX - I know there has been some discussion on the value of this promotion, but again would appreciate how best to redeem this. My ideal would be to get a reward PE using miles and then buy one economy ticket and use the voucher to upgrade to PE!
Phew!! Hope this makes sense and thanks for your help.
I have never booked reward flights before and am finding it a bit confusing! When I enter dates which seem to have an available reward flight according to the matrix, I then get a box up which says I need to call VA direct. Is this normal? Any advice on how to actually find dates when flights are available would be appreciated.
On another point, I also have a Economy to PE upgrade voucher via AMEX - I know there has been some discussion on the value of this promotion, but again would appreciate how best to redeem this. My ideal would be to get a reward PE using miles and then buy one economy ticket and use the voucher to upgrade to PE!
Phew!! Hope this makes sense and thanks for your help.