Backyard Cocktail Hour

So, I am having my wedding ceremony at our friends home, it is about 1.5 acres. The cocktail hour will also be there, and then the reception is at another location, about 30 min away. I am trying to plan my cocktail hour and am just getting stressed. I have already ordered the high cocktail tables, and am looking to borrow low tables from my church. Decorations are also taken care of for the most part. What I am struggling with is food. I'm not sure how to do it. I don't have wait staff, so I was planning on just setting food out, but with 150 guests I'm wondering if this is a mistake. The same with beverage. My wedding is in January, and it will be chilly so I was thinking a hot cocoa and coffee station with marshmallows, various creamers, cinnamon, nutmeg, and then a bailey/brandy option to put in their hot beverage. This was the only alcohol I was going to offer, as well as water and lemonade. Now I am wondering if I should offer more alocohol (beer and wine) or even a signature d