So I read a lot about this, any tips on how to diagnose it ,and what to replace I got oil leak and bubbles on the coolant

 

So, are you stating that your water pump is leaking oil or leaking coolant?
Coolant can leak from the area indicated by the red arrow with wear below or the periphery if the fasteners are loose.


And / or are you finding oil or exhaust gases ('bubbles on the coolant') in the #1 coolant reserve tank below?

 

Normally coolant leaks into oil, not the other way around.

Bubbles mean you have air trapped in the cooling system.

 

Sounds like your oil pump seal is leaking and so is the water pump.
You may have to remove the timing belt to replace both of those seals