Hello Dan, welcome to the dark scary world that looks so good on late night TV infomercials. I have been doing this for over 40 years and would be happy to give you whatever help I can offer. I am not a hi tech kind of guy, but do pretty well with that email stuff. I can also find my way around a spreadsheet, with some effort.
Two issues for you to start with are: when looking at a fixer, the basics of real estate applies even more and that is location, location, and finally location. You can pay more for a well located fixer than the cheaper one that backs onto the highway.
The other is that a buy and hold is just a flipper that did not sell. You must alway live with "Plan B" as Plan A never works. Most of my deals actually went to "Plan C & D".
You must always calculate the rent your fixed up unit will demand and that rent had better cover your costs. Your investor will need to agree to a "hold" also, or he will force the sale of the property to regain his investment, even if it means you take it in the neck.
Happy Thanksgiving