This will be my first game ever.

Game: D&D 5e
Group preferred: Online
Experience: New
Location/Timezone: AUSTRALIA , NSW
Availability: I work shift work so it varies
Preferred role: Player
Game style: Just wanting to tag along in a game and learn the mechanics etc etc.

What kind of online Text PBP, Text Chat, Audio Chat, Video Chat?
Story arc, Sandbox, Scheduled interval, or drop-in,

You could try Rpol https://rpol.net/ for PBP, 

If you would be okay with Text chat, 24/7, multi-dm, multi area, intermittent activity, RP and Roll play sandbox you could check out "Gaia" discord.
 
https://discord.gg/V6QSG8

Thanks.