Almost all states put their 'high school graduation requirements' online. The list is a good place to start giving you what is expected of a high school graduate in your state. Just google for them.
Take the SAT, SAT II and ACT tests. Colleges are interested in seeing those scores. Without them I'm not sure they will even look at your application.
https://sat.collegeboard.org/register
http://www.act.org/products/k-12-act-test/
Consider interning at a law firm and working on a political campaign.
And consider finding an adviser if your parent does not want to help with your homeschooling. It is not smart to 'teach yourself'. You end up skipping things you don't understand and miss out on other things because there is no one to make suggestions of things that might help you. Just that you are asking here tells us that you are missing things and need an adviser.