Oh and if you apply through Uefa, you can tick a box and that will indicate you are happy to receive tickets in a different price category to the one you have selected... they will only ever move you up or down by one category maximum though. This was done for Euro 2016 and this years Champions...
By far and away your best bet is to become a member of the England Supporters Travel Club (ESTC) and go to as many games between now and the draw in December to build up your caps (loyalty points). Even if you can only get to games at Wembley and none abroad you'll steal a march on most people...