osiol:
But I worry about the future.
We all do.
There are three ways of creating the future tense:
1/ A simple one (imperfective verbs):
(pronoun) + być (in the conjugated, future tense form) + infinitive of the verb in question.
I will see Mark next week = (Ja) Będę się widzieć z Markiem w przyszłym tygodniu.
Everything will work (fine) = Wszystko będzie działać.
2/ A less simple one (imperfective verbs, so I suggest using the first one, but for your understanding I present also the second option):
(pronoun) + być (in the conjugated, future tense form) +
past tense form of the verb in question (the correct person, 1st, 2nd or 3rd, singular or plural, and as you know with the past tense you need the correct gender - male/femele/neuter).
I will see Mark next week = (Ja) Będę się widziała z Markiem w przyszłym tygodniu. (if a female speaks) / (Ja) Będę się widział z Markiem w przyszłym tygodniu. (if a male speaks).
Everything will work (fine) = Wszystko będzie działało (wszystko = neuter gender).
3/ The regular one (perfective verbs):
this looks apparently like the present tense, but since the perfective verbs don't have the present tense, it's the future one :)
See examples provided by other posters below.