We use the first type of conditional sentences when the condition is real and the situation we are talking about is not imaginary.
To build the first type of conditional sentences:
If {present simple}, then {future simple}
Examples
If you practise a lot, you will learn the language quickly. "practise" = condition, "will learn" = result
If it rains, we will stay at home. "rains" = condition, "will stay" = result
If I get a raise, I will earn more. "get" = condition, "will earn" = result
We won't wait for Tom if he is late. "is" = condition, "won't wait" = result
We will go to the Burger King if we don't find a McDonald's. "don't find" = condition, "will go" = result
Alice will visit us if she is in Warsaw. "is" = condition, "will visit" = result
Notice that we can begin the sentence either with the condition or with the result. It doesn't affect the verb tenses.