I will warn you I'm probably not the one to ask the lots of silly questions to as I barely know what I'm doing myself.
Almost everything I've printed with mine has been terrain pieces for the Star Wars miniatures game I play. I feel this is the perfect use for this style of printer as wargaming terrain is either extremely expensive (one pack of the official terrain for Legion would cost £40-50, and you'd need 3-4 of those packs to provide enough playable cover for a full game), or lacking in variety (those same packs are nothing but walls and rubble). Typically these are 3D models I've bought for reasonable prices (between £4 and £10 for a pack, with enough variety in each to mostly fill a full board), that print without any supports necessary, and that I then paint and decorate myself. Here's a recent example:
I have designed and printed a few of my own fairly simple models, such as
these adapters I use to mount my larger Gundam models to stands I create from mic stand parts - I've used Autodesk Fusion for this. I'm definitely not the person to ask questions on this software; I basically re-learn it almost from scratch every time I have to use it.
The multi-colour printing that the combo pack on the A1 will do is something I don't have any experience with. I've watched videos on printers that support it, and by the looks of it it's fairly wasteful, as every time it needs a colour change (and as 3D printers print layer by layer, this will often be a change for every colour, multiplied by the number of layers, so it can add up to
thousands of changes for even a relatively small print), it has to retract all of the filament from the feed tube, print a small bit to clear the print head of any remaining plastic, and then feed the new colour in. I don't know how much time each of these changes needs, but I reckon it'll be significant. I'm getting better with painting, I'd prefer to just do this by hand rather than produce waste plastic and increase print times.