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Hello, meko1999 and welcome to our Support Community!
Great questions! Your SIM and plan are activated on the date of purchase which is also when your bill cycle would start. You'll be billed from that date on but if you have a postpaid account, your first payment wouldn't be due at the time of activation. My best recommendation would be to stop by a T-Mobile Store a day or two before you leave to pick up your SIM and test it out in your phone.
What type of phone do you plan on using? You'll want to make sure you're set-up to leave the country by going through this checklist: International roaming checklist.
Please let me know what other questions you have!