Hey @pippety!
My mum has passed on some advice for you! She's said she's so happy that you are considering fostering/adopting, and the fact you want to do it already shows you are the right person for fostering.
Practically speaking you will need a stable job (she was a teacher and my dad is a policeman), with a stable income that doesn't fluctuate too much. A decent sized house will help, 3 bedrooms minimum is usually what they look for. A garden is pretty much a must. The hours you work have to be child friendly, any very long hours won't work. A good support network looks good, as does living in a decent area close to good schools. Having great references is essential. But really the most important stuff really is the emotional. Patience, resilience to stressful situations and the ability to examine situations and be the person you need to be in that scenario help too. You have to have an open mind. You never know what is going to come through your door, and when. You have to be able to make quick decisions. Empathy is probably the most vital part of it all. Most situations you come across you will have never come across before. You will hear stories and wonder how that's ever even happened to a human, but you have to show them that you understand what they have gone through and you are there for them no matter what.
My mum says just an overwhelming sense of kindness will go further than anything. She wishes you lots of luck and sends lots of love xx