Welcome fellow Steemian, you're welcome to this awe-mazing community of people who are willing to better themselves.
So let's get straight to the point, you've signed up, what next?
Signing up is like moving into a new neighborhood, school or job. First things first, make new friends and you do that by starting a conversation.
"Hey! Jessica that gown looks perfect on you, (Jessica turns to look at you) sorry I'm Ted, and I'm new in the hood"
Luckily for you if Jessica is an outgoing person, in less than three days you'll know almost everything and every other person in the hood.
Same applies to steemit, after signing up, it's advisable to follow any of the big whales here (Jessica) so they can show you round the community and how it works.
Don't just follow them, comment on their post, (that's you starting a conversation) Then introduce yourself ("sorry I'm Ted and I'm new in the hood")
And voila! You my friend are set to have an awesome time in this awe-mazing community. Once again you're welcome to STEEMIT