Usi del futuro

In general the future is used:

- to describe actions or events happening in a distant or unspecified future:
Un giorno sarò ricco - One day I will be rich

- to express the intention to do something in the future:
In estate andrò in vacanza a Parigi - During the summer I am going on holiday to Paris

- to express a possibility or a probability:
Suonano alla porta. Sarà il postino - Someone is ringing at the door. It will be the postman

When talking about events happening in a near, imminent future, and when referring to scheduled actions, or giving instructions, you can use the present tense:
Che fai stasera? Vado al cinema - What are you doing tonight? I'm going to the cinema
Le lezioni cominciano a ottobre - Classes will start in October
Quando arrivi a Londra, vai subito al consolato italiano - When you arrive in London, go straight to the Italian consulate.