Keep in mind
@Karla *******
that the thai consulate in Vientiane takes 3 WORKING days to issue visas,
SO
if you apply on the morning of the 18th you will not be able to get your passport back until the 22nd (Monday afternoon).
Go to the website of the thai consulate in Vientiane, read the requirements the tourist visa. Meet the requirements to the letter and you'll get the visa
you need the bank statement,
you need proof you're FLYING out of thailand in 60 days from the date you apply for the visa (proof you're going back to your country is better than just proof you're flying to a nearby country)
and
you need proof you have confirmed lodging for the whole 60 days you will get stamped in on the tourist visa
That is a NO NONSENSE thai consulate, you meet the requirements you get the visa, you don't meet them they'll turn you away.