Here are the national organization sites (in alphabetic order):
And to help choose between them, if the decision isn’t obvious, here is a link to Project Vote Smart.
All these sites will also help you find where you need to go to cast your votes.
If you’re at least 18, and an American Citizen, (and not a felon or incompetent), you are entitled to vote.
Get informed. Imagine your future. Make note of the candidates best suited to match your intended future, or present situation. Go Vote for them.
God Bless the U. S. of A..