Massacre (Daemon vs High Elves)

So this is my maybe 4-5th game of Warhammer Fantasy, these notes really are for me, if someone else benefits kudos.

Not that the title is any surprise to most people.
I played a 750 pt league game last night (well Mike had 825). Mike was a very polite High Elf player, fielding
1 Noble
1 Mage
12 Phoenix Guard (I think, this might of been 16 Guard)
11 Spearman
And the ever present Bolt Thrower

Versus my Daemon army of
1 Khorne Herald on Juggernaut
15x bloodletter
10x bloodletter
5x Fleshhounds

It wasn't the fact that I lost that was so surprising, but the simple fact that I was totally annihilated. I seriously don't think I even killed 10 elves. I mean I'm used to being outnumbered. But when I outnumber my opponent and then get slaughtered it is disappointing.
After much thought I have narrowed it down to several reasons (besides not having lots of game experience)
1. I changed my deployment strategy mid-deployment, I reacted to his deployment, which given the small point count and the small number of units I never should of done.
2. I had a chance to charge my fast unit (Flesh Hounds) though terrain and flank his big unit (Phoenix Guard). Instead I took the easier route which was to charge headlong into his spearman, big mistake. They died, one round of combat.
3. The only fact I KNEW about High Elves was the Always Strike First rule. This means that regardless of who charges they get to strike first. So before the game I convinced myself to charge forward headlong without regard to them being able to charge me. It didn't work, I couldn't convince myself in movement to just move forward without regard to him being able to charge (This alone cost me a complete turn of being shot at)
4. By this point the game was over, however I should of put up another fight by charging my Herald with Juggernaut into combat and then follow that up with my bloodletters, instead I charge with my bloodletters and let the Herald setup for a flank (Units of less then 5 unit strength CAN NOT flank, I know this)

So in summary, I should of gone with my original strategy of a double pincer. I should of closed the gap as fast as possible. Flesh Hounds are NOT a front line troop (duh).