I will advise you to pay at least half tuition fees.. Its not of necessity you proof of payment for accommodation but that of tuition fees is very important.. After you have paid your fees, the DLI will update your admission profile and you can print it out from there.
You don't really need to worry about proof of accommodation but if you already secure an accommodation and feel like showing it, it isn't a bad idea which also help your application
Worry less about the accommodation and more on trying to pay at least half