From what I’ve read on the forum here it seems like you have a good approach to evocation. I am still learning myself and working on developing my astral senses and would very much like to make contact with Lucifer as well.
So far I usually light some candles, incense and draw Lucifer’s sigil, and offer some of my blood on it. Then I will meditate on it with my intent and chant his enn. I always think in my mind that he hears and knows that I’m reaching out.
I’d suggest perhaps doing a petition spell to Lucifer and ask for him to help you develop your astral senses.
Also these two posts have a lot of great information about Lucifer.