Hi Pam
Many thanks for your comprehensive reply - it is very much appreciated.
I've used 1/4 aluminium rod for a large(ish) heart, but I'd consider that to be a simple sculpture. I don't think I'm giving anything away by saying mine, at least, is simply rod bent into a heart shape, with quads of 5" balloons twisted on to it, in the same manner as if you were making a column. Not too tricky.
However, let's say (and this is genuinely hypothetical) I want to make a tea pot. The request is for it to be large (perhaps 5' high and about 6' at it's widest point). In my mind's eye, I see that this is probably three circles of aluminium. One representing the lip where the lid sits, the second being the widest part of the pot, then a third circle the same size as the first, for the base of the teapot. The handle I can weave from 260's or 350's or something like that and attach once I have the body of the teapot made. I suspect I'd do the same with the spout. Would the lid be 'framed' with something (in which case what and how) or would it be weaved?
But.... it's the mechanics and logistics of construction I'm struggling with, or if I'm even on the right track.
I need to be able to connect these three circles, somehow. Do I use lengths of aluminium rod? What's the best way to connect it at either end to the circles? I probably need to cover the whole body in something like chicken wire (but I think that would be too harsh in terms of it would pop the balloons. Is this where the cling film comes in?). I then need to cover the entire surface of the body with round balloons. If I make clusters of balloons, and these are quads, for example, how do I attach them 'flat' to the surface. But then, if I attach them flat, I'll have a 'hole' in the middle of the quad where all the necks are tied... So do I tie in single balloons? Would something like a Rouse matrix or SDS solve this?
I could go on(!), but I'm sure you get the picture.

So the training I'm looking for is more engineering, techniques and thought processes.
Please though, I'm honestly not making a teapot or anything similar, so I'm not looking for 'free' answers to the questions above. It's really just a made up example to highlight the areas I personally have mental blanks with, and therefore the areas I'd like to see various interpretations of how to solve (through a training course).
I hope this makes sense?!?!
Best regards
--Neil