These offer several suggestions but the worship of Hecate can take on many forms. In my experience, she is generally a kind-hearted and understanding Goddess. So any way that you can show your appreciation and devotion to her are welcome. I hope this helps.
Crossroads are a potent symbol in many cultures. When I first learned of her, I contemplated such places, especially in isolated, rural areas. That might be one starting point, so to speak.
I know that I always get a shiver up my spine (in a good way) when I'm on a nature trail/hike and stand at the center of crossing paths...
This was more eloquently phrased somewhere I read once - I'll do my best to paraphrase it.
Deities and spirits are the grown-ups to our childish mortal selves. If you have researched aspects of a deity, and you feel like they would be a good fit for you, then there is no -wrong- way to offer devotion to them. So long as you are faithful, and you call upon them to guide your path and watch over you, and you commit to said relationship, then they appreciate what you do.
My young child gave me a picture for my birthday last year - the three of us in our house holding hands and smiling. It hurt - we were mid-divorce, my wife obviously didn't even acknowledge it; it was memories that we wouldn't get to make, and a reminder of the life we no longer had. It was also ridiculously goofy looking.
But my child was aware of none of that. Sure, I would have rather a different gift, but the effort, the thought, and the love that went into that was what counted. It's still on my fridge.
The same works with the divine. So long as what you do, you do with love, then the message is appreciated. As we get older, I'll want my presents to simply be time with just the two of us, so I can come to understand the person that is within my child, and so too will they understand me.