Best call the airport first. Take tie down gear. Gate code will depend on where you go, sometimes its the CTAF, sometimes it inside the gate, sometime you have to ring someone for the code. Some airports want ASIC and rego details before divulging the coded (Ie Longreach).
If you want parking and its Class C or D, ask SMC for details. If class G most places have an area for GA parking. Sometimes I have landed at airports where its not clear and just asked a local for details.
Last but not least, ALWAYS read ERSA and Aerodrome (DAP) charts, because some places get really shitty if you even taxi in RPT areas. Usually the aerodrome is marked to warn you, but prior knowledge is always a good thing