@Natalie ******
, For entry to Thailand, You better have three-proofs-of (you may or may not be asked to show at the immigration):
Accommodation in Thailand (at least for the first several nights), onward travel within
*****
days, funds of 20,000 THB or equivalent in cash.
Also, you may want to check with your air carrier if they let you board with the outbound ticket 60 days after or without a ticket when you don't have a valid visa to Thailand. (for further detail, ask your air carrier)