Newbie needs help.

Hi all. New here.

Can someone please give me some advice on what I need to (as if I’m a child).
I believe this is buffalo grass firstly.
I ultimately want to stripe my lawn. I have (I believe) a lot of dead grass clippings below the lawn. I’ve watched and researched on what to do, but I thought I would post here for someone to be able to give me specific advice, rather than generalised videos.

I’m in Australia. (Not sure if there is a primary location for this sub)
Currently summer – around 25/35 degrees Celsius.
Have another month or two of heat, and then into autumn/ fall.

Thanks in advance.

The grass looks great from afar but when you’re on top of it, there’s alot of ‘patches’ in between. It’s not ‘tight’ I believe is the term.