Excellent! Good for you!
You should be able to grow chillies without lights (might have mixed results at harvest time ... but mine do all right raised from seed on a windowsill and put in an unheated greenhouse from around May onwards), so the lights are "bonus".
I have a 400W Metal Halide grow lamp. I bought it to bring on some seeds in late Autumn (Canna Lillies, I heard on Gardeners World in September that sow in October and grown over-Winter with lights they would be big enough to flower in their first year, whereas sown in the spring they wouldn't - so ... like you ... I "tooled up". They flowered in November
and I harvested 250 additional seeds in December
)
Anyways, I think 1000W is too much. I think you would be better off with two lamps of half that power (well, 2 x 400W would probably do, or a 400W and a 600W). 1000W is going to cover an area of 2 or 3 sq.m. I doubt you have that many plants?!! yet. However, once they are bigger you might well want the extra light.
But you could avoid the running cost of 1000W by just using the "smaller" lamp when the plants are small.
I run my lamp at night on Economy-7.
1 watt on permanently 24/7/365 is about £1.50 a year. 1000W on 12 hours a day will therefore be £750 (although I realise you won't need them for 12 months solid, and they may only need 9 hours a day)
You need to get your seed to germinate though. Put some seed sowing compost in a small-ish pot - 2" will do for up to a dozen seeds. Stand the pot in tepid tap water for 10 minutes, and then put on the draining board for half an hour, and then it should be ready to sow the seeds. Put the pot in a clear plastic bag (e.g. freezer bag with a pull-tie or a zip-local bag), it won't need any more water (the bag will prevent any condensation escaping) until it has germinated. Put them in the airing cupboard (check the temperature for the seeds you have, I'm not a Chilli expert, but probably around 20-25C). They aren't the fastest of things to germinate - mine took nearly 14 days.
Once germinated open the bag and put under your lights. Hold the back of your hand flat and upwards towards the light at the position where the chilli leaves will be. Slightly warm feeling is fine, any warmer and move the light higher. The light will probably be 24" away from the plants, maybe a more (1000W is a lot more beefy than my 400W so I'm guessing). After a couple of days remove the bag.
Water when they have got quite dry - I wouldn't actually leave them to wilt when they are tiny seedlings. Take two pots that are the same. Stand one in water for 10 minutes (as above) and then compare the weight of the wet one with the drier one. With practice you will be able to tell from the weight whether it is getting dry, or not.
Good luck!