The everyday way to talk about the future is ir in the present + a + an infinitive — just like English going to:

Pronoun	Ir	+ a + infinitive	English
yo	voy	a viajar	I'm going to travel
tú	vas	a comer	you're going to eat
él / ella / usted	va	a comprar	he's / she's going to buy
nosotros	vamos	a salir	we're going to go out
vosotros	vais	a nadar	you're going to swim
ellos / ellas / ustedes	van	a dormir	they're going to sleep

• Only ir changes; the second verb stays in the infinitive.
• Don't drop the a: Voy a viajar, never voy viajar.
• In conversation it covers English will as well: Mañana voy a trabajar. — I'll be working tomorrow.
• Vamos a + infinitive can also mean let's: ¡Vamos a comer! — Let's eat!