You may of already thought of the following so sorry if I’m telling you what you already know. But IME the ‘nice to have’ come last on the list (important obviously but they are the last stage of getting the property ready).
Join some Facebook groups for holiday let owners. Very useful on asking questions about legislation, marketing, where to source furnishings, what works well, what problems there are.
Assuming you are in the UK!
Read the pink book and make sure you are happy you can comply with relevant legislation. https://www.visitbritain.org/business-advice/know-your-legal-obligations
Be aware that there are rules about qualifying as a holiday let for tax purposes. And for being treated as a holiday let for business rates (and that if not depending upon where the property is in the UK you may be charged 300% of council tax if you don’t meet the business rates criteria).
do a decent budget.
look at lets in the area, how booked out are they? What prices are they going for? Are they comparable to what you will have to offer? Will you want to use some of the peak weeks? (Summer holidays, Christmas and NY, easter and half terms?) and factor in.
work out how you are going to market. Be aware if you use an agency they may take eg 18% of your revenue before anything else (before vat so would be about 22%). Learn how to negotiate with agents and what you can ask for in terms of % and in terms of owner bookings.
Who is going to clean. Who is going to do maintaniance when you need something fixing (happens a lot). Who is going to do laundry? Be aware people struggle to find reliable cleaners. And reliable ones are not on minimum wage by any stretch of the imagination. And good reviews rely on the property being immaculate.
Factor in gas and electricity and that guests won’t care as much as you do re your bills! You can use eg hive/ nest but people will complain if they don’t have plenty of hot water on tap and aren’t warm. And on a rainy day may well be inside all day.
The market is saturated at the moment, lots of people jumped on the band wagon during Covid thinking easy money.
I hope this helps. It is VERY rewarding to provide a good holiday experience for people and I’ve met lovely lovely guests. But it’s not ‘easy’ and I need to be very hands on. and at times it’s very stressful (eg damage done and new guests arriving a few hours later and you need it to be perfect for them). I read a lot about horror story guests, and there are a lot of people getting out of the industry. You really don’t make as much as you think you will after tax, and needing to save that money to then do repairs/ replace white goods/ re roof properties and all the other stuff that having a property entails.