Disclaimer: This is what my office does. Database, networking, application development, and lately (most importantly) security.
This is for a major component of the DoD...couple hundred thousand users.
First off - this is a major learning curve.
How large is the IT dept? Currently, you are, at best, a Year 0 apprentice. Qualified to touch absolutely nothing.
"I have no basic knowledge in the IT field."
Another degree is not what you want....you need experience, and secondarily, certs. Possibly multiple certs, depending on your specific role. Security+, MCSE, Network+...those are just the basics.
In the past, we've hired people with NO degree, and turned away PhD's.
Not knowing your specific company and what they expect of you, and your particular role...it's tough to get more specific.
But you need to glom onto someone else, and suck everything out of their brain that you can.
If you are in a 1 deep role, you are absolutely screwed. Unless you've been doing this since you were 10 years old simply for the love of it, you cannot learn it at a corporate level by yourself. Even then...
You WILL get something badly wrong. And "corporate wrong" is bad. Jailtime bad.
Additionally, personal relations are a key factor as well.
You need to be able to tell a high level manager why the stupid thing they want to do Will Not Work. (I did that just today...lol)
And make him or her feel good about the "No".
Bottom line - Go slow.
"the basics" of database is just enough to get you in major trouble. Or any other aspect of the IT field.
Witness all the security breaches we see at least weekly. A server admin with no idea what he is doing.
The idiot applications out in the field...why oh why does a flashlight app need access to your contact list? A clueless "programmer".