This is the 14386th most frequent Russian word.
отправится
To set off or depart.
This usage of 'отправимся' is in the future tense and indicates the action of embarking or starting a journey.
Завтра мы отправимся в путешествие.
Tomorrow we will set out on a journey.
Here, 'отправились' is used in the past tense to describe someone having physically departed to return home.
Гости отправились домой поздно вечером.
The guests left for home late in the evening.
In this sentence, 'отправлю' refers to the action of sending, demonstrating its application to dispatching items.