I am tiptoeing up to high school, but I've been collecting information.
The previous poster is correct, but I have a couple of things to add. The assessment that you submit after your first year of homeschooling (if you are not doing standardized testing) is a portfolio sort of thing (though it can be super informal). You need a teacher who has a license in the state of Ohio to submit a statement saying that your child has made "adequate yearly progress." Easy peasy. For graduation, it's STRONGLY recommended (but I think not required) for you to keep the excusal letter (excused from compulsory attendance) for the child's senior year. I keep ALL of my kids' letters. When you submit your intent to homeschool, you have certain things you want to say (or not say in your letter), such as that you're going to provide 800 hours of instruction. You do NOT need to log that time. No one does, and it's not checked. You also submit a list of intended curriculum that shows you are covering the required subjects (listed in the legislation)--the list is for informational purposes only.
You do decide requirements for your child to graduate, but I think the state does have minimums for public schooled kids. The workshops I've attended have tiered recommendations for the level of college you think your child will attend (select, Ivy, state school, etc.), though you definitely want to look at specifics for schools your child is looking at.
The dual enrollment option is called College Credit Plus. It's been revamped in the last couple of years, and they are still tweaking here and there. There are fees homeschoolers have to pick up that public school students do not. There are grass roots efforts (writing to the state, etc.) to get that changed. In fact, if you join the Facebook group Ohio Secular Homeschoolers, you might find out about some of that stuff (you might mention that you are not in OH yet in case that's a requirement to join). You can post any homeschooling in OH question there. The group is not restricted to secular homeschoolers, but the page is for posting information that is secular. They are a great group for information. If you land in the Cincinnati area, there is also a Facebook page for Cincinnati Secular Homeschoolers.
The process for utilizing CCP has firm deadlines, and many things you want or need to do can be done concurrently, some after the deadline. I think most of those things are SPRING dates. Some of the hoops read like a process, but it's more like a checklist. If you do it like a process, you might find that you are up against date conflicts between colleges and the process, though I think colleges are trying to make it as easy as possible--many hold information meetings for interested parents. I do think some of the things you need to do are contingent upon one another, but not all of them.