Hi and welcome! I think you will find that this is an open and welcoming space with very friendly people.
I have read that if you think Hecate is calling you, She probably is. It is best practice to note the kind and number of events that suggest to you that She is calling you. If there are repeated events, meditate and use some form of divination to verify.
As for working with Her, there are many ways to do so. Check out the Spells8 page about Hecate. She has many correspondences and epithets, so how you work with Her may depend on what your goals are. One of the best ways to start, in my opinion, is to read about Her. There is the Spells8 page, and articles all over the internet. Read from different sources, and compile the information that speaks to you in your BOS. There are videos as well that have good info. Researching Her is a way of beginning to work with her. As I suggested above, your relationship with Her will be unique to her. Some will caution you about Her, but they are speaking about their relationship. Also check out the Hecate’s Night post. Silverbear posted a video about Hecate Invocation that I found useful, and there are links from others as well. Here’s a link
I’m pretty sure that helping others learn about Hecate is scoring me some points! 
And if you ever need anything, or have any questions about anything, feel free to post on the forum. Someone will always try to help. Again, welcome, Merry Meet and Blessed Be!