Hey Kyle, as a lender of both hard money and DSCR (refi) I am happy to send you over some term sheets which show you exactly what your out of pocket would be, and your cash out would be on the refi. You also need to consider the debt coverage (ie holding costs).
My suggestion on the first is to have a good team. What market are you located in, do you have a good contractor, does the rental comps conform to a healthy DSCR ratio?
The actual cash you leave into the deal is more dependent on a few variables. 1) Was the deal bought correctly 2) how fast can you exit and get it bringing in cash 3) How is the debt structured, and how much cash are you leaving into the deal at exit.
Obviously, the goal is to leave as little cash into the deal as possible, but the other above issues can contribute (almost every deal we have seen go south is from a bad GC).
As a buy and hold junkie i hate saying this, but sometimes its best to flip one first. Go to local meetups, see who is prevalent in the contracting side of things but also find a solid, local lender. Eventually if you establish a relationship with the lender, you can get better terms (if they are direct) Partner with the very well reviewed GC on the first deal maybe...give up a little equity in the deal.
Most lenders are going to (due to experience) give you less - ie 75-80% loan to cost. But once you build your experience with them they will lend 70-75% loan to value. We have a little, rough calculator on our website that shows cash out of pocket on each scenarion.
Message me if you need any additional advice, and GOOD LUCK!!