Good Luck!
I have been a single mom on and off again for 8years.
Really if your going the internet route it doesn't much matter which site you use. There is all the personal dating sites, myspace, tagged, etc..There's guys everywhere it's all about weeding through and finding a good one.
I know how difficult it actually is waiting months and months to introduce your kids to a new dating partner. My advise is you don't necessarily have to wait forever just make sure they're a good pick, and you've found out their skeletons and really know them first. My dd is 8years old and her dad has been out of our house since she was 6weeks old. I've introduced her to 3 boyfriends I believe, 1 being semi serious and one being extremely serious. The extremely serious one whom I've known for 3 years is the one who has bothered and upset my dd the most. It's not about how long you know someone. This guy and I have a complicated relationship including the fact he's now the dad to my baby. Now the guys my dd has met and were only in her life briefly haven't effected her at all, it's the long term one that has. My dd is very attached to one guy he has been in her life for 3 years, he's more of a dad to her then her real dad but weren't not married and who knows if we ever will marry so just be careful it's not always the amount of guys or how quickly they come into one's life as the long term relationships. I had a psychologist tell me with kids they don't really have a hard meeting people and never seeing them again as this is part of life and they do this in their own circles of friends, they switch schools, they constantly meet kids on sports teams, scouts, this and that and never see most of them ever again. Just remember your kids come first over any boyfriend.