what kind of entry should my family pay for

Hi. My family live in Melbourne of Australia. We all hold Australian passports.
We are Australian citizens visiting china for 2 weeks.
The city we are visiting is Da Lian city of Liao Ning of China
We are 2 adults and 2 children . My son is one year old and daughter is 3 and half
How many visa should we apply for? What kind of entry to apply for? What price for each?