Should I get a flat or not?

I would really appreciate if you can give me your opinion on this as I feel quite unguided. I am on my early 20’s,female and been living and working in the UK for almost 3 years now though I am German. For the past 3 years I’ve lived and still am living with a housemate as it’s affordable for me. I just found out that my brother who is 18 years old is coming over in a few months to also work over here and I am more than happy to have him over as I don’t have any relative over here. What worries me is the fact that he’s going to go here without a job and I know he will find one hopefully soon but in the meantime I’ve asked my housemate if he can stay at ours just for a few weeks until he gets a job. But I am confused If I should get me and my brother a 2 bedroom flat to rent for about 6 months tenancy just so I can guide him here until he gets settled but it’s going to be expensive of course to have your own flat and pay bills. I don’t want to just leave him to find his own random housemate when he’s never been here before and doesn’t know anyone and though I’ve done that myself years ago and survived I just worry too much for my younger brother:(

Thanks for reading this.