I just enlisted as a Civil Affairs Specialist today as a reservist, what can I expect from this job?

As a junior enlisted Soldier you may have several functions. You may be used as a data miner going through published information on a country of interest and helping your Civil Affairs Team leadership develop a profile of the country's civilian landscape. During Key Leader Engagements, you will likely be taking notes of the engagement and helping your Team leader establish a relationship with the key leader (tribal leader, elder, law enforcement official, mayor, etc.)

You will likely be a vehicle driver for your CAT (Civil Affairs Team), and possibly pull security while the team leader and team sergeant engage with the local leaders.

If you happen to land in a higher unit, like brigade level, you may find yourself part of the CMOC (Civilian-Miitary Operation Center). In this, you will assist in sorting through all the events that occur during combat operations and providing the information the leaders need to determine what events involving local civilians have an impact on military operations. If there is a displaced civilian collection point or camp set up, then you will be involved in processing the people that move through the camp.

1SG (Join to see) would be a good resource for this question

You will a lot of chances for deployments because 90% of your field is in the Reserves.

If you work with natives then understand them. What is their ideology. How does their ideology govern their actions. What are they passionate about? Who are their leaders? What do they want. What are they lacking. What are their martial capabilities. What are their weaknesses. What are the strengths. What is their history. Understand their culture.

However, this is not entry level stuff.