Again, with the Chase biz cards you can't have had an app with them within the last 30 days. Since you just got the CFU you'll actually want to wait until at least Oct/Nov to do your next Chase biz app to avoid potential shut down.
That credit union CC you got less than 2 years ago does count. You'll want to go onto Credit Karma to pull your credit reports or do them elsewhere to ensure it's been at least 2 years since you got the Dis card and to find out when exactly you got the credit union card. If it has been over 2 years then you are 2/24 with the CFU and credit union card.
It's great that you've read up on stuff, but had you posted here what you were thinking about doing we would have been able to tell you how to do it. But also for this, what are your goals for getting the cards? Do you have trips you are planning that you need points/miles for etc?
There are several different ways to go about churning, us knowing what you are looking to do with them is a big part of that along with if you have a willing player 2 that can also get cards. If you do have a P2 then we'd also need to know what cards they have and when they got them. It's all to help you best accomplish the trips etc that you are trying to do and to stay within the rules and avoid a potential Chase shutdown. Things also change fast, yesterday Chase came out with a new rule for the Saphire cards that you can't get the bonus again if you've gotten it within the last 48 months, until yesterday it was 24 months. You don't have to keep up with this thread, because it can move fast, but do ask questions.
And I forgot earlier

. We are a nice helpful bunch but we will ask a lot of questions at first to be able to help