Suppose this is how you'd want to introduce yourself:
English: Hi. Nice to meet you. I'm Patricia/My name is Patricia. How are you?
Dutch: Hallo. Leuk u te ontmoeten. Ik heet Patricia/Mijn naam is Patricia. Hoe gaat het?
Alternatively, you could also start by saying:
Goeiemorgen (good morning);
goeiedag (good day);
goedemiddag (middag = midday, so you'd use this from 12 to about 4 or 5 pm)
goedenavond (good evening)
If it's not really a formal situation, you don't really need to use "u" for you. A simple "je" should be enough, unless if it's someone's parent or a teacher.
If you want to add your age, you'd simply say: "Ik ben x jaar oud." (I'm x years old.)
Have fun learning!
Sven