planning a month is Oz

I've been thinking month long stay in Oz.

I've just inherited a small amount of cash, which hopefully I'm going to
use to visit Oz and NZ this year.

I quite enjoy roughing it to be honest, I don't want anything fancy, I'd
be happy to use a tent.

I'd quite like to, either hire a camper, or, hire a car and drive from
Perth to Brisbane. Driving the distance isn't an issues for me, I drive
a truck all day long.

Or, do the same road trip via bas or train.

Am I right in thinking I can get a visa waiver as I'm from the UK?

Do I need a place organised for my first night in Oz, as you do when you
fly to the US?

I'm going to mainly use credit cards to pay for things, I can draw cash
(maybe expensive) on my CC. I will take a small amount of A$, but I
don't like to have too much on me.

Any other suggestions, or something I've forgot?

TIA