Well, this series is not a terrible place to start, but it is worth chasing up your own research as well. My focus is very much on the Faiyum, and Sobek there is not the same as Sobek in Kom Ombo, so I’d research as much as you are able to, and always ask questions of other devotees. There’s no harm in comparing notes when you’re just starting to honour a deity and you need to calibrate your discernment.
Other than that, just make an offering, light a candle, say a prayer or a hymn, and just talk to Him. You may need a lot of patience to hear Him. He can be very subtle and not always clear about what He’s saying to you, but persevere, check with divination, ask others to help, and always trust your instincts. He is a kind, gentle, wonderful god, and He will protect you very well if you let Him.
I can’t really help with Sobek-Ra, though. It’s not an aspect of Sobek I seem to get, even though I incorporate the Sobek-Ra-Wesir stuff into my mythos and practice. I think it’s possibly because I see Sobek standing in for Ra in these stories, not as Sobek-Ra, and so Sobek ACTING as Ra is very different to Sobek-Ra. My Sobek is much cooler, much more Sobek-like, and doesn’t have some of the qualities of Ra that I’ve seen Sobek-Ra devotees talk about.
But like I said, talk to other devotees and see how your Sobek compares. And, ultimately, do what you feel works best for you, and don’t feel you need to stick to any particular practice you see others doing if it doesn’t call to you. Your relationship with Sobek is yours alone. Never let anyone tell you you’re doing it wrong if you’re happy with your practice, and Sobek’s happy with your practice.