Agree, start with little things till you are 100% sure, it is something you want to get involved in. There is no point spending hudreds of pounds and then find out, you don't even like it.
My partner and I started domestic cleaning business and our first and basic equpment was, good hoover, bucket with mop, that's all. Build your way up gradually and consistently, and as mentioned, don't expect milions in one day ;]
Thanks,Adam