Was wondering if anyone can help me out with these i have run diagnostic, these are the codes and what they mean... but its all gibberish to me

... any ideas on what i need do to?
16486 (P0102) Mass or Volume air Flow Circuit Low Input
INTERMITTENT
17608 (P1200)---Unknown Trouble Code
17748 (P1340) Engine RPM Sensor Plausibility
INTERMITTENT
VAG-COM Version: Release 311.2-N
Control Module Part Number: 06A 906 032 DR
Component and/or Version: 1.8L R4/5VT 0002
Software Coding: 11500
Work Shop Code: WSC 00000
1 Fault Found:
17608 - Boost Pressure Control Valve (N249): Mechanical Malfunction
P1200 - 35-00 - -
The engine management light is on and to me, the turbo doesn't seem to be giving as much kick as it used to.. any ideas on what i need to change?