Congratulations! Way to dive in.
I've seen this discussed from time to time, so a site search may prove helpful.
I remember seeing someone discuss bedroom carpet islands. So, not using carpet in hallways but if only in bedrooms it's disconnected from other rooms and relatively easy to replace. Plus you can use remnant/end of roll pieces that are cheaper with turnover.
If the house has hardwoods, I've seen some talking about uncovering those - although some say not to due to wear and tear. It seems more frequently now I see landlords talking about using click and lock vinyl, like Allure or similar. I used a Lowes version in a rehab last year and it was a big selling point - used it in a bathroom. It was expensive, though. But, a small area. I've also seen ceramic tile that mimics . . wood or whatever being discussed. Or, just tile in general due to longevity. If you have a Restore, you may be able to get that cheap and if you catch it coming into the store soon enough, maybe you can snag a bigger lot.
I have a paint color I use that I got as a recommendation off this site. I even started using it in my house. I can't recall the color offhand but it's a greige and I've used it in a few projects and got good results. A suggestion would be picking a color and sticking with it so repainting is easy with turnover. A good classic color is great. Use it throughout and maybe a color in the same family but darker (?) for a bathroom or a bedroom or two.
I've also seen some folks using large tile pieces for countertops. Google it and you'll see. I like that idea and I'm really thinking about it for a lipstick rehab here soon. I've seen some nice closeouts on higher end tile and you may not need much depending on your countertop. I'd have to really price it out to be sure it was saving me a lot.
Not sure if you need cabinets but just an fyi that paint can be a nice boost for tired cabinets. Also, if the boxes are good replacement doors can be had for a good price. I was going to order some online, but called a local cabinet-maker instead. The price he quoted was great if I could allow them to be done between his larger jobs. I was going to get them professionally sprayed - well worth the money if you ask me - I've painted my fair share of cabinets in the day and it's not as easy at it looks to get really good results. There is also a very popular gel stain on Amazon that is awesome. I used it on a bathroom vanity. I just went right over the old stain with a very light sanding and it came out great. For that, I just used a Lowe's gel stain.
In a flip I salvaged the carpet but cut out a square by the front door and used snap together vinyl. Those sort of things, to me, will help extend the life. I've also seen some landlords talking about getting large mats to be used by doors if the flooring is water sensitive. We used the super cheap laminate in an old house and that stuff lasted for 10 years until we sold. It was showing it's age in some areas because my family doesn't take shoes off like they should. But, with mats by the door I was surprised how it lasted. We did not use it in wet areas like kitchens and baths. I've heard Costco can have good prices on better laminate.
Pinterest is chock full of ideas. Good luck to you! A lot of this also depends on the neighborhood and what your competitors are doing.