Spicy soup base and chili bag, sesame oil and other things can be brought into Australia? Do you need to declare ?

No declaration required. I'm from Chongqing and I also brought two packages. Actually, Apollo Bay and other supermarkets also sell them and the prices are acceptable.

Do not use

Seems like you also love hot pot.

Don't need to declare, meat, animal products, wooden products, medicines, cigarettes need to declare. I have lived in Melbourne for ten years.