Welcome to the forum, and congrats on your purchase.
I can't remember what the recommendation is for the first firing when the kiln is empty, but as this is just to make sure any binders, etc are burnt off, I doubt it matters which programme you use. With mine, the Skutt Hotstart Pro, you did the first firing with the bung out and it was a bit pongy, but for some reason its in my head that the Firebox 14 doesn't have a bung, is that right?
No, you don't need to be with them all the time, but with my Skutt which was at home, and my Hobbyfuser down at the studio, I stayed around to make sure that when it reached fusing temperatures it did stop there and not carry on! Only the first time though, I don't now, I might come in to the studio, load it up, switch it on, and leave again til the next day.
I can't tell you how long the pre-programmed schedules last as I put mine straight into full Pro mode, so set my own, but they last around 12 to 17 hours, although a lot of this is the natural cool down being so slow. I set mine to slump something the other day, went back around five hours later and it had just reached the annealing cool down step.
Again, the Hotstart Pro got a little too hot to touch directly at full temp, but I can get within inches of it, air-wise. I think about a foot of space is usually recommended around the kiln as a safety measure.
Remember that if you're using the Glassfire mode, that I think it's set to Spectrum 96 tempetatures, so if you're using Bullseye, you might find you have to adjust.
Biggest temptation a lot of people find when they get a bigger kiln is to load the shelf ful lon the first proper firing, "so as not to waste money on an almost empty kiln" - however, you'll find that your kiln should only cost around a £1 to fire a full fuse, which is far less than a shelf full of fusing glass will cost you!
All kilns are slightly different so it may take a couple of goes to find the optimum temperature yours works at - but that's all part of the fun of getting to know your new kiln!