I cannot stress this enough: do some legal research
This, this and this again.
You must know the legalities of what you can do, what you can't do and what you must do.
Do your checks, but trust your instinct. I went against mine once (went for the tenant in the well paying job over the one in the average job) and it was very, very costly.
Get decent insurance. Know what it covers.
Treat it like your business, but their home. That means whilst you might go 3/4 weeks waiting for a new boiler if it happens before payday that doesn't mean your tenant should.
Don't get sucked into believing common myths - you can't just let yourself in for any reason if you give 24 hours notice being the main one.
Make sure you have a handy list of local repair people that you've vetted from reviews before problems occur. 2am is not the time to find out there are no plumbers locally or the likes.
Make sure you have a contingency plan for any time you are away. What are you going to do if you are on holiday and your tenant needs something fixed? You can't get arsey because they've interrupted your break. same with be prepared that if the boiler breaks on Christmas Day or your birthday they'll be in touch and you will have to deal with it.
Think logically about things like decorating, picture hooks other home improvements. Are you going to allow them? If not then why not? (A lot of people I've asked that question to over the years have only had 'because...' as an answer - remember your business, their home)
Depending on where you are and how big a difference there is between LHA and private rent it can be worth seeing if there is a council scheme running. Locally here you can rent your house to the council for two or five years. The guarantee rent, no voids, they cover all minor repairs and they also deal with the tenant leaving at the end of the scheme (either by move to a council property or elsewhere). The reduction in rent still made it very profitable because there was no voids or fees.