Travel systems UK

Mrs P • Wife & mummy to a 10 month old. 👼🏼 11th of Dec 2017 💔👼🏼
My head hurts so much. 
All I want is a lovely travel system that includes everything.
This isofix base is confusing me I want it but I'm so confused what fits on to what. I really like bugaboos, Joolz, icandy - I seen a lady with an icandy base and a maxi cosy car seat. Do those car seats fit on most bases? Could I save money this way? Ahhhh what are all you ladies doing? I'm a FTM zero experience with this. Any help welcome lol