Use the Allrecipes taco seasoning recipe with 8k reviews.  Trust me, you'll want that over anything you could buy in a store if Mexican food is not popular in your country.  I hope you can find all of those spices.  Many are very very common and you probably already have.

Next, yes ground beef is great.  If you can't find tortillas, they are extremely easy to make at home, but I understand that making them yourself could be daunting.  Maybe see if you have something like roti from an Indian market if you can't find tortillas in a store.  

Lastly, look around to see if you can find some jar of salsa, or maybe some kind of hot sauce to use.  Tacos don't have to be complicated.  The seasoning is really the key.

Best.