Can officiales help me please thank you?

1. I need a functioning wallet for windows
2. How much will it take in disc space (gigas)? If I have to download the whole blockchain...
3. Do I have to back-up something a seed or what ever ?  Is the seed the 26 word random paragraph?
4. I have a wallet that I created and it gave me those about 26 words that I´ve written down. Are these words all I need to have access to my wallet?
5. I mined komodos to that wallet and they got there, but it never functioned so that I could have sent them to an exchange for example.
6. I´d like to get those Juggaloe-Jumblerones but I´d rather not risk loosing my exchange bought Komodos in the process.
7. Eventually your wallet has to be easy and secure enough against amateur users to not loose their assets off by mishaps, bugs.