Did you sow these seeds indoors?
What is your growing zone?
If you are in zones 8-11 you can direct sow your seeds outdoors after danger of frost.
If you are in a colder zone, 7 or lower, you would need to either wait until frost danger has passed or start indoors.
There are many reasons for lack of seeds germinating.
Did you seeds come in a seed packet? A seed packet generally has all the germination information needed.
Make sure you used a soil less seed medium to start your seeds.
These links have more information.