Please take a look at the pictures I managed to get from the Hartlepool Fireworks display in November.
http://www.jhphotos.co.uk/html/h_poo...orks_2008.html
I found shooting tricky as a very strong North Easterly wind was gusting.
This was the first time I had gone manually with a DSLR taking pictures, the past few years I had been using a bridge camera on auto.
This year I set out with my SLR (Sony A100) lens 18-70mm (I used various lengths with this lens during the display) and a very sturdy tripod. Good point with this display was it was on the beach, so I was able to dig the tripod into the sand for increased stability.
I had read "Outdoor Photography" and they had an article about shooting fireworks.
I shot mainly with ISO 200 (the article said best results ISO100) at F 16 (Article was saying about F16- 22), with exposures between 2 & 20 seconds, also I set my White Balance to sun.
The last picture was taken at F3.5 1sec ISO 400.
http://www.jhphotos.co.uk/html/h_poo...s_2008_17.html
You are best using a wide angle lens, don't zoom in as you may miss what you were wanting. If you are wanting close up shots of the fireworks shoot wide and then crop when editing on the computer.
Hope this is of some help.