@Ginger Brown - we look @ a variety of things, most importantly: credit history/score, liquid assets/reserves, source of down-payment, the property & deal's numbers, and experience. Private lenders (individuals lending their personal funds) have less requirements.
Your credit score & experience will affect the leverage you're getting. If you're new to flips or rehabbing a rental, expect somewhere between 75% - 80% of purchase & 100% of rehab costs as long as that total loan amount is at or below 65% ARV. If you have some experience, then that may be bumped up by 5% - 10%, so 85% - 90% of purchase price & 100% of rehab, at 70% - 75% ARV.
The as-is value & ARV will be established in the appraisal or interior broker's price opinion --whichever the lender requires. It's a sales comp approach, so I would pull some comps w/in a mile of the subject property for both the as-is & ARV. It would be helpful to send those to your HML but not required as ultimately the valuation report will be what's relied on.