The most convenient way to enter Myanmar is via air and there are three international airports – in Yangoon, Mandalay and Nay Pyi Taw. The most used airports are Yangoon and Mandalay. Very common transit points to Myanmar are Bangkok and Singapore. One can fly in to Myanmar via Kualalampur, Phnom Penh, Siem Reap, Dehong and Kunming as well.
It is possible to enter Myanmar overland with much difficulty mostly from Thailand for a day trip. If you want to use this mode of entering please check in details. Not a very convenient mode though.