A few I am assuming is three. If I had $300k, I would do what they call the BRRRR method on here. Buy a house cash, at a good deal. Rehab it and be all in at 70% after repair value. Throw in a good tenant or Airbnb it, wait your 6 month seasoning period (thats the case for me anyway) and then refinance it within the parameters that makes sense to you. I never use Airbnb rents to determine how much I refinance. I always use conservative 12 month lease rates. For instance, a 2/1 that I have on a 12 month lease rents at $1320/mo yet my 2/1 that is on Airbnb does a bit better at around $1800/mo on average. I will not base my refinance off $1800, I will base it off say, $1300. I just feel more comfortable with that. Personally I would pull out an amount where my mortgage would be roughly around $600-$800 which would leave me $700-$500 for Maintenance, Repairs, Vacancy, CapEx and cash flow.
This method allows you to churn your money and get more bang for your buck.
Conversely you could buy 3 homes cash and cash flow fairly decent, yet your ROI will be very unappealing but that may not matter to you. Depends all on where you are in your career I suppose. For me, Im growing, so I need and want the best ROI I can get. Currently I am refinancing two properties that will essentially put me at an infinite return on both deals. Meaning I will have no money of my own tied up in the deals yet still get to keep the asset, with the cash flow, with the tax benefits and with the tenants paying down the loan.
Lol, Or you could use the $300k as a down payment on a much bigger property and jump in the multi family space. I personally would do that at this point in my career, because Ive got all the SFR's cash flowing and pretty much cashed out ready to deploy on a bigger scale, but again, I just don't know where you are. Thats a big piece of it.
But if we can assume you did happen upon $300k, you are sitting in a much better position that most starting out and thats for sure. The biggest step is the fist one. Jump in, make mistakes, learn. Its the only way. Good luck.