Hi 11111,
pick a name that's upbeat, not depressing, not too descriptive. Northernlass55 or Doesn'tLikeSprouts or something. It really doesn't make that much difference unless it's something which will put men off like 'LonelyGirl42'
and a headline - always start with a joke or a catchy line - at least that's what makes the profile stand out from all the others. Don't use the same cliches about how much you love traveling (everyone does), how much you like going out but equally happy staying home snuggling on the sofa with a glass of wine and a DVD (everyone does), how you're looking for someone to go on long country walks with (I hate country walks, personally, thats why god invented the car)
Talk about what you like doing. Nights talking rubbish with mates, a nice work out at the gym to work off the cobwebs, birdwatching (if you're into it) tv programmes you really like, books you love. But it only has to be 2 or 3 paragraphs. I generally judge a profile, and whether I want to get in touch, on the following points (assuming they're within the age and distance range)
Do I like the pictures, including the worst one
Did the profile make me smile, or ideally laugh out loud
Failing the second one, do they look interesting enough to hold a conversation with.