There’s a lot here too:
I started working with him using the Beelzebub compendium 6 from BALG almost a couple years ago now. I’m still learning, but hopefully I have something helpful to share
Booze works fine usually I offer him whisky, rum, or red wine. Tobacco also works. Food-wise, I’ve offered cured meats and dark chocolate before and seemed work fine.
I maintain a small altar with other stuff like the fetish I made for him (based on a ritual in the Beelzebub compendium- I think I shared a picture of it in the above link), crystals like smoky quartz and obsidian, some herb candles I made for him, a picture I drew of him, and booze occasionally
Something more extreme that I did recently was I got a tattoo of a fly (using an image from the Beelzebub compendium from BALG as a reference image) with his sigil on the wings. My friend was the tattoo artist and she used a few other images as well. I knew her from undergrad when we were art majors, and I love her style, so I thought whatever she came up with would work out. I heard that the process of tattoo-ing is a form of blood offering
Knowing that the fly association came with JCI, and he’s actually “the Lord of all that flies”, I asked him if this was ok a few days before getting it done- if he’d rather I do a few different animals/bugs that fly or a completely different design instead, but the solo fly was fine. 
I’ll add more to it later