If you are going to do something soon (within about a week), then you will you the futur proche (near future) tense. This tense is rather simple, using the connjugated form of aller and a verb in the infinitive. It roughly translates to "going to do something" in English, although with an emphasis on the action happening soon.
One important note: aller plus an infinitive can also mean "going (somewhere) to do something", where it is much more literal. Context will be very clear about which one is intended.
- demain = tomorrow
- après = (here) afterwards
- bientôt = soon
- après-demain = the day after tomorrow
- aller chercher = to pick up (someone)
Duolingo Lesson: www.duolingo.com/skill/fr/Futur-proche