You will need to find your voice for comedy before you get out there and tackle that 
brutal world called an audience. You will have to get your thoughts down on paper and do some writing.

Use a notebook with lined paper (preferably letter-size paper or smaller) and write down whatever thought you have. Anything that is unique to you or your family would qualify. Don't use scenarios that are private in nature. Your friends and relatives may not like you after that.

Go to some comedy shows and study professional comedians. You won't see the same routine, but it's a good idea to view them to get some insight on what you want to do. Get to know some of them so that you can get your foot in the door.

Work on some stand-up comedy material for yourself. See what you can find in yourself that could be workable as a great comedy piece. Use situations that you feel have a lot of feeling and meaning.

When you have enough to last for a while, then find an open mic session. Bring your 
notebook in the event you need a refresher. Hit up the audience with some jokes and make yourself visible as much as you can.

While you're out, if you see something that could be a premise for future comedy 
material, then take notes of your observations and findings.