The future tense in Spanish is used to describe what will happen or what someone will do in the future.
Take the infinitive of the verb, and add the future ending. The endings are the same for all verbs.
buscar (to look for)
buscaré - I shall look for
buscarás - you (singular) shall look for
buscará - he/she/it shall look for
buscaremos - we shall look for
buscaréis - you (plural) shall look for
buscarán - they shall look for
You can also form the future tense by saying "I am going to ..." This requires the use of the present tense form of "ir", and the use of an infinitive. The use of "a" is optional. Some examples:
Voy (a) ser bueno hoy. I am going to be good today.
Voy (a) ir a Cuba por mis vacaciones en 2011. I'm going to Cuba for my holidays in 2011.
Voy (a) buscar por Joe. I am going to look for Joe.
Vamos (a) hablar en una conferencia. We are going to speak (talk) at a conference.
Vas (a) dormir. You are going to go to sleep. (literally: You are going to sleep)
Van (a) comer junto. They are going to to eat together.
Remember: the verb used must be an infinitive, because if you say "Voy (a) juego al voleibol", you are actually saying "I am going to I play Volleyball", which doesn't make sense at all.