I've been on a few dates from an online site. Didn't meet my current guy there, but I have made some good friends. Here are my tips:
Don't mention past relationships. Like your very first sentence - don't put anything like that. Or things like "I'm sick of fake girls/cheaters/whatever". You might be, but you'll just come off as bitter and carrying round baggage.
Don't write a huge essay, but at the same time don't write something so short and vague that it could be about anybody.
Don't just stay chatting for ages - you need to meet up. It's really hard to push yourself to make the transition (especially the first time), but it's only a date and it's supposed to be fun. Worst thing that happens is you'll spend a few hours being bored and/or underwhelmed.
For a first date keep it short and sweet. Coffee is nice and simple. It also means that if it's going well you can extend the date for dinner/daytrip, or easily call it quits without it being awkward.
Put a picture. Nobody looks at profiles if it doesn't have a picture.
No pictures of you with an ex. If you happen to have a really good pic where you happen to be standing next to your sister/mate, make sure you put a caption pointing out it's just your sister/mate.
You probably will feel weird the first time you meet.
Don't expect many girls to message you. Most wait and hope for a message.
When you send a message, don't just write something like "Hi, how are you?". Chances are the girls get an awful lot of these, and usually they're from guys who have mass messaged anyone who looks nice without bothering to read the profile, so they get deleted.
As for living at home, you'll have to navigate it the same way you would in any other relationship. I've never seen it mentioned in a profile whether someone lives with parents or not, so I don't think it's necessary in a profile (it's hardly one of your defining characteristics). But obviously if she asks, you tell the truth, just like in any other conversation. If you've had relationships with girls your age before without this being a problem I don't see why it would turn into one just because you met on the net.
I know two couples that met online. One is celebrating their 5th anniversary and one is celebrating their kids' 1st birthday.
