when do we use chinese numbers (일, 이, 삼) and Korean numbers (하나, 들, 셋) ?

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@Elinmenopi A general rule to know is that when you're counting physical entities, you'd almost always use native Korean.

For other quantities, it's better to remember what is counted in native and what is counted in sino-Korean. It might help to know that sino-Korean is used with counters associated with ordinality or ordinal numbers.

Counted in native Korean(You change 하나, 둘 into 한, 두 when they are with other counting words.):

Hours (for both telling time and duration)
Age
Months (only for duration)
Number of physical objects
Number of locations, people, types

Counted in sino-Korean:

Minutes (for both telling time and duration)
Months (only for dates)
Years (for both telling time and duration)
Money/currency
Measurements
Numerals themselves in phone numbers, the number of a question on a test, etc.