Eldar vs Necron

so i went to the bedford gladiators club on monday and faced off against a necron force which consisted of the following:-

2 lords warscythe and ressi orbs
45 necron warriors
5 scarab swarms
4 destroyers
2 tomb spyders

total 1500pts

eldar list consists of:-

autarch on jetbike
5 fire dragons plus an exarch
5 howling banshees plus an exarch
6 jetbikes inc warlock with witchblade
8 dire avengers inc exarch
wave serpent
8 dire avengers inc exarch
2 vypers
2 falcons

so the mission was dawn of war annihalation

i went first and deployed only 1 falcon and 1 wave serpent in my corner he deployed all his on the opposite side first two turns not muched happen i took out all his destroyers and his scarab swarms but then cam those bloody gause weapons and his rolls of 6 on armour pen i lost both falcons and then the assualt was shocking so i should stand back an shoot in future just stay out of the way. i killed 38 necrons over the last 3 turns but all but 6 of them got back up they were brutal on there rolls

end game score necrons 6 eldar 3 (should of been 20 but those bloody ressi orbs are crap)

so i will post the progress of the eldar and hopefully people will read how terrible i am at 40k and then send me advise