What options do I have for financing this next venture?

You'll have Craigslist, Biggerpockets, referrals, you can call title companies, and even other wholesalers if you have no luck finding a buyer. 50% of a deal by co-wholesaling or joint venturing is better than 0% of no deal.

I inherited my stepdad home unfortunately because of his passing...I have always wanted to do the Airbnb venture and thus unfortunately gave me the opportunity.

You can get into a Joint Venture (JV) where you bring the deal and sweat equity, and your partner brings the financing.

Venturing into the real estate industry is a fantastic goal.

Oh, let me count the reasons, stark and clear,Why in the Rockies, dreams might disappear.Firstly, time's dance, a tango unforeseen,Delays and setbacks, patience in between.Secondly, budgets shift in mountain air,A treacherous venture, costs rise with care.Like winds that howl, a financial plight,Draining pockets in the mountain's height.Thirdly, expertise, a crucial call,A craft refined to prevent the fall.In rocky realms, build cautiously,For seasoned skill shall guide to victory.Oh, let me count the ways, with wisdom's might,To pause the dream, build in clearer light.Where were you CountTheWaysGPT when I needed you?

I've decided to take my experience to the next level and venture into flipping houses myself and hoping to see it become more full-time in the future.  

Since I am a beginner, do I not venture into STR just yet?

You can also see if you can joint venture in a LLC with a private lender

As I start this venture, I want to avoid the mistakes of other PM's and learn from those who provide and excellent service to their clients.