I've had all kinds of success with both wood and dark elves. I'm sure I'd be ok with High elves too, but I've never coached them. As a general of about 10,000 points of WH Dark Elves, I could never in good conscience field those little punks in Blood Bowl.
Anyway, my starting Wood Elf team is always:
1WD
10 Line
2rr
8ff
I've never lost with them in their 1st game (about a dozen or so tries) The WD is the master of the field, and everyone else is good too. They can all run, pass, catch, dodge, and hit pretty well. Back when it only took 11 SPP to get 2 skills, I got to the 2nd skill a few times with the WD without getting him the MVP. It's really rude to show up to your second game with a dude that has 5 skills, and that statline.
Dark Elves I start this way:
1Bl
10 Line
2rr
9ff
10ktreas
I don't have a perfect first game record with them, but very good. (Anybody that tells you elves aren't good early on doesn't know how to coach em!) My first ever team was a Darkie team (loved the minis and the attitude, that was before I started playing WH, prolly why I have them as an army) Lost my first ever game on the last turn (had to make 1gfi to tie the score with a reroll and failed)
Anyway, they work well too. If you'd rather you can just as easily switch the blitzer and 10k for a witch, but I don't trust them in a first game. They're kinda psycho, and only AV7, and with no bench you can't afford to GIVE somebody a free KO'd (or worse) elf. You could also switch a line elf, the 10k, and 2ff for a 2nd blitzer, but I really like having max ff for elves, you can only buy it once. Then buy the apoth and a witch (then it's safer!)
As for question #3, if ANYBODY has any input on that one I'd LOVE to hear it. Been trying for years to find a way around that one! (See note about first ever game, and you have the SLIGHTEST INKLING of what I'm talking about)