Learn Russian: Наша работа здесь.

Possessive pronouns like "our" have to match the gender of the noun they belong to. The word for work, работа, ends in -а, making it a feminine noun. So, we must use the feminine form наша instead of the masculine наш.

Where is the word for "is" in this sentence?

In Russian, the present tense of the verb "to be" is almost always skipped. You just put the subject (наша работа) directly next to its location (здесь), and the "is" is understood automatically.

What is the purpose of the little ь at the end of здесь?

That is the "soft sign". It does not make a sound of its own, but it changes the way you say the letter right before it. Here, it makes the с sound soft, meaning you say it with the middle of your tongue raised slightly toward the roof of your mouth.

Does работа mean the task I am doing, or the place where I work?

It can mean both! Depending on the context, работа can refer to your tasks, your career, or the actual physical building or location where you do your job.