This lively video explains how to discuss future plans in Spanish. Professor Jason explains that it's not that difficult for English people learning Spanish as the same construction is used for 'going to'. There is also a separate future tense, using one set of endings that you simply add to the infinitive, but adding a stress on the final syllable, except for the first person plural. Of course, it's not quite so simple with irregular verbs, which have a special stem which has to be learned before you can add the future endings. There's a special nuance similar to English in the 'I will' form, as opposed to the 'I'm going to'.