There is no one 'future tense' in English. There are 4 future forms. The one which is used most often in spoken English is 'going to', not 'will'.
We use 'going to' when we want to talk about a plan for the future.
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I'm going to see him later today.
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They're going to launch it next month.
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We're going to have lunch first.
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She's going to see what she can do.
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I'm not going to talk for very long.
Notice that this plan does not have to be for the near future.
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When I retire I'm going to go back to Barbados to live.
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In ten years time, I'm going to be boss of my own successful company.
We use 'going to' when we want to make a prediction based on evidence we can see now.
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Look out! That cup is going to fall off.
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Look at those black clouds. It's going to rain soon.
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These figures are really bad. We're going to make a loss.
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You look very tired. You're going to need to stop soon.
We can replace 'going to go' by 'going'.