What should I factor in when moving from a 50/34T to a 53/39T I have a 11-32 cassette.

I'll be looking to do this for short 30km rides and long 100km rides on the weekend. the 30km rides have a few hills, nothing major, whilst the longer ride is generally quite flat.

Other than changing the chain to compensate for wear as well as factoring in the larger diameter of the new crank what else should i consider?

Apologies, I am very new to cycling and not sure where else to ask or where to look for information.
Changing from a 34 to a 39 chainring is roughly the same as changing from a 32 to a 28 max rear sprocket.  In other words, you'd lose your lowest gear.