By exit strategies, I mean having enough equity to be able to drop the price significantly to move it in case of an emergency or as you said, offering a lease option or taking less in rents to at least break even so that you don't come out of pocket. I can't stress this enough. The more exit strategies you have, the less stress you'll have to deal with and the easier it will be to move from deal to deal.
I don't know of a general rule of thumb in how much you should leverage. I feel strange that I, of all people on here, said something about it because I try to use leverage to my advantage as often as possible. I would just say to ensure you have plenty of equity for a quick sale or for pulling cash out for an emergency or whatever. You just want options when the crap hits the fan and if you're over leveraged, your options will be limited.
As for what you do next, that's completely up to you. I was asking about your next deal to see if it fit in with what you were trying to do and how much you'd have out.
It sounds like you need to decide the direction you want to go in before you take very many more steps. It's not that you can't do rentals and rehabs at the same time, but I think it's a good idea to have a plan together about how you're going to attack each deal and spring from one deal to the next before you get there. If you have goals, you're likely to have better success and more progress.
As for the group deals, I would stay out of them unless you really know them well or have things drawn up in a way where you're as safe as possible. You may even want to consult with an attorney about it before you get in very far. I've seen and heard about too many deals where people get screwed, all while thinking they're in a sweet spot. Nothing will turn you off from real estate more than the dishonesty that's out there.