Congratulations @Jeremy Mangen!
First let me start with what caught my attention. Specifically, it was that you're not falling prey to the false idea that because you are investing with a trusted friend that somehow the legal approach is unnecessary. Bravo! For everyone questioning this notion I only wish I could break attorney-client confidentiality (which I cannot), because I could tell you one heart-wrenching story after another where the lifelong friendship (or family relationship) came to a halt - and equally painful, their tales of defamation and gossip within these lifelong networks of support. I've been through it myself; one of the most difficult challenges I've ever faced!
Now, more to your question about the best way to get your legal house in order.
What I've observed with new investors is they tend to either err on the side of overdoing it with complex trust/entity structures. Or, they underdo it, looking for the cheapest, quickest solution. I suggest the happy medium is to at least get the basic docs from an attorney (and have the CPA review them) or from a CPA (and have the attorney review them). Both CPA/Attorney are foundations to a successful business!
As to protecting that valued relationship with your friend, know that technologies used in downloadable forms just are not sophisticated enough (yet) to get you to think through the kinds of critical "what-if" scenarios that typically don't get asked without the prodding of an attorney.
And, by the way, I am one such attorney, and I would be delighted to help you out with your deal structuring! I'm sure @Brad Schaeppi and @John Woodrich would also provide great assistance, as @Basit Siddiqi has suggested. In fact I've spoke to @John Woodrich myself a couple times and found him very knowledgeable and easy to work with. (I haven't yet had the pleasure of working with Brad.)
Bottom line: It's worth the money to hire pros. Shop around and get comfortable with your team of advisors.
Happy Investing!
Heidi