You already have the near future, aller + infinitive: Je vais partir. — I'm going to leave. French has a second future, the futur simple, in a single word: Je partirai. — I'll leave.

The recipe is short: take the infinitive and add -ai, -as, -a, -ons, -ez, -ont. Verbs in -re drop their final e first: prendre → prendr-.

Pronoun	Parler	Finir	Prendre
je	parlerai	finirai	prendrai
tu	parleras	finiras	prendras
il / elle / on	parlera	finira	prendra
nous	parlerons	finirons	prendrons
vous	parlerez	finirez	prendrez
ils / elles	parleront	finiront	prendront

The endings are almost the present of avoir: j'ai, tu as, il a, nous avons, vous avez, ils ont. Every future form has an r just before the ending.

One more verb for this lesson: oublier — to forget → j'oublierai, I'll forget.