If it is your first time to Myanmar and when you arrived to Myanmar airport, you should consider about Telecommunication first. You would probably need to confirm your arrival to your family and friends by social media or messengers, and so you sure need internet communication.
So There is 1st important thing ,
1 - Buy telephone Sim card
Sim cards are offering by SIM counters in main area of airport . You can find it by big words "MPT" , government operator in Myanmar. You only need to show passport and money. Do not finish with only buying SIM card, you also need to fill prepaid credit because there is no credit in new card. Do not forget to fill prepaid credit.
2 - Set Internet Setting (Access Point)
After you have SIM and valid prepaid credits, you need to ask SIM counter to activate internet setting. If you forgot it, you need to set internet access point manually as given below. World without internet is not good for every reasons, basically you need to have it for your google map. So make sure you having active internet connection before leaving Airport.
Manual Internet Setting -Go to Setting -> Mobile Network -> Access Point. Create New.
For MPT - Name = MPTNET, APN = MPTNET, APN Type = internet
For Telenor - Name = Telenor, APN = INTERNET, APN Type = internet
For Ooredoo - Name = Ooredoo, APN = INTERNET, APN Type = internet
Leave other settings as default.
3 - Start going to Yangon
If you are ready to go. Do not worry about language problems, use your google map or apple map and pre-save or stay at screen those indicating your exact destination location address with pictures and phone No. This can help you a lot without talking too much to taxi drivers. Now you are done for about what you should be done in airport, sorry, do not forget to go to toilet because Yangon is under peak traffic jams.