The easiest way to come to Tumling is:
If coming by air - Bagdogra Airport (IXB)
If coming by train - Siliguri Junction Station (SGUJ) or New Jalpaiguri train stations (NJP).
Depending on your nationality and VISA status you can enter Nepal via the Pashupati Nagar Border crossing or the Kakarbhitta Border crossing.
You can come to Tumling via the Pashupati Nagar Border Crossing.
If you are a citizen of a country other than you will need to obtain VISA There are various ways of getting a VISA. There is a VISA on arrival facility at Kakarbhitta border crossing.