I'm high risk but I can give you a general idea.
They won't normally see you until 12 weeks unless there's medical reasons to do so.
They normally try for the heartbeat from 15 weeks

They should do a 12 week scan for dating, to check for downs and other problems.
Then you have the 18-22 week scan. Checking for problems, gender (if you wish to know)
Up until 28 weeks (i think) appointments are every 4 weeks.
From 28 weeks until 36 weeks, every 2 weeks.
From 36 weeks, every week.