John's shuddering and I'm smacking myself in the forehead!
Don't do the Christmas lights request. Instead, since you've found out that some people may want something like that (next year), practice with your or friends' and relatives' Christmas trees and start figuring out how to do it.
You cannot practice on clients, paying or not. You could do some trade; they pose, you exchange their time for a few photos, but stop the freebies. Find ways to get in some practice, you aren't ready to be in business yet from what you describe. Too often something doesn't go well early on and the person never gets into any sort of even part time business with photography, it's over within maybe 2-3 years. Or they've been so underpriced that they realize it's not worth the amount of time for the little money they make and are done with it. You want to set yourself up for success and need to learn how to do that. 'Months' isn't even close to enough time to have put into this to be even an aspiring pro yet.
Do what John said, treat it like it's a paying job. People are showing up that late because you aren't a pro and they aren't going to bother to be on time for an amateur with a camera. An hour is ridiculous. Some photographers charge for extra time; 10 minutes stuck in traffic, OK, a half hour or more? gets charged for the time. The extra cost'll get them there on time!
You seem to have good ideas and may be engaging well with people but need to work on improving your skills. I'd say get out with just your camera and practice - you've cut people's feet off, you need to get better at framing. Color or exposure looks off on some but it's hard to tell from a photo posted on here from a phone (quality often seems to get lost in the process). These are pretty decent, far from the worst of what's out there. Keep practicing with your camera and take your time getting into a portrait business because it looks like you could get good at this, there's potential there. Try
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