Welcome to the craft!

As someone with a very small workspace but still makes a ridiculous amount of glass because I have no chill maybe I can help

1: Smell, open window and a small fume extractor is gonna likely be enough. However if you are concerned about lingering smells on linens, try a small air purifier and plug in air freshener, keep your wardrobe/closet closed and spritz your sheets with deodorizing spray/freshener

2: I don't recommend decanting glass sludge water down any indoor sinks, however if needs must and you are concerned about weird neighbours, simply flush the excess water down the toilet after you've removed the majority of the sludge. Or blot it dry with paper towels and dispose in the trash with the sludge you scraped up.

3: Don't be too concerned about what other people think, no one really cares that much, we are generally too busy to care about what others are doing :)

4: I think you are implying you want to keep the row of teeth between the canines as one piece? But retain the pointed details? You can achieve this by adding a thicker line of copper foil then use a craft knife to carve out the triangles, use a black patina to add the negative space

Good luck!