In Spanish we have three main forms with future meaning: presente de indicativo, perífrasis de infinitivo and futuro imperfecto.
Futuro imperfecto. As the English simple future this tense gives information about the future and it is basically a prediction. The speaker thinks that it will come true. Mañana me levantaré pronto (Tomor! row I will get up early) Perífrasis de infinitivo. Ir (present) + infinitive. It has same meaning as “going to” form in English. This form expresses an intention or immediate action. Mañana voy a levantarme pronto (Tomorrow I am going to get up early)
Presente de indicativo: Is the same as the English present continuous with future meaning. It is about arrangements o planned actions. This Spanish tense has both meanings (present and future).
Mañana me levanto pronto ( Tomorrow I am getting up early )
SUGGESTION: I THINK YOU COULD ADD THAT IN THE ENGLISH, WE ALSO USE PRESENT SIMPLE (e.g.: Tomorrow I leave for Montreal.) AS WELL AS PRESENT CONTINUOUS (e.g.: Tomorrow I am leaving for Montreal.) I THINK IT SHOULD ALSO BE MENTIONED THAT IN SPANISH, THE PRESENT CONTINUOUS IS NEVER USED WITH FUTURE INTENTION THE WAY IT IS IN ENGLISH (e.g.: “El lunes, estoy empezando una clase de aleman.” THIS IS NOT SOMETHING A SPANISH NATIVE SPEAKER WOULD SAY, EVEN T! HOUGH IN ENGLISH WE SAY “Monday I’m starting a German class.”)!
As well as these forms we have the futuro perfecto that equals to future perfect in English.
Mañana me habré levantado pronto (Tomorrow I will have got up early )
And the same thing happens with the futuro continuo that is very similar to future continuous in English. Mañana me estaré levantando pronto ( Tomorrow I will be getting up early)