sun roof leak and blue exhaust smoke

[fatpassat1234]

hi, im new to this forum so bare with me as i figure this out.
anyways i got a b6 vw passat 2007 estate and theres a leak somewhere in the sun roof im pretty sure but i cant seem to figure out exactly where the water comes from. when it rains there some water markes near the driver side where the hood latch is just between the latch and the gas pedal.
also another problem i have is the blue smoke coming out the exhaust, ive read online that its probably the turbo, just wondering if its even worth replacing or just letting go. hate the idea but money do be tight. any recommendations on where i could get a new turbo or rebuild it ?
thankyou