Umm, I think you could afford an interior designer!
But as I'm awfully generous with my pearls, here goes.
The lower balcony is an informal extension or your living areas, and will probably count as living floorspace more often than not. I would include an outdoor kitchen along the side wall, and install a floating timber bar top along the balcony wall, as a drinks bench or informal dining slab overlooking the city skyline. At the opposite end a vertical garden wall and a grass carpet, turf lawn rug in that area. I would introduce round outdoor furniture to encourage relaxing, perhaps exterior grade beanbag or more contemporary rattan tub chairs, with charcoal upholstery. Ones that can rotate to face your flat screen when entertaining. So one end is lounge the other dining, although not sure a table would be needed as the dining area links from the inside and doors can open Ruhr up, so the bench and stools is all I'd do, to keep it feeling light and spacious. Use bold and bright pops of colour in cushions along a built in timber slatted bench at the lounge end along the balcony wall, build this is a seat with storage capacity running almost full length stopping a t the mid wall section, change direction so it's an L shape, with the L a planter box also in slatted timber, but filled with plants like ginger plants. Tis will act as a divider between both ends but not all across.
Upstairs as it's huge, divide with a slatted wall, perhaps with stainless steel mirror sandwiched here to reflect each end, my reason is to give both bedrooms their own private balcony. Box furniture each end, and Provide a pull out line both sides of the screen. Mobile planter boxes on castors so they can be moved for sunlight. Let these two separate decks be an extension of the personal bedrooms, with individual colour and finish. Although I'd paint the inside of your balconies in a concrete grey so they disappear into the horizon. Try horizontal bands of grey, graduating from charcoal at the bae, then into lighter greys at the top, take your colour cues from the city skyline.

I'd give some thought as to how you want to use each of the spaced. For example, I would personally be reluctant to use the upper patio for entertaining because it would mean traipsing up and down the stairs to the kitchen for snacks, drinks, etc and also because I'm not keen on guests looking into my personal living spaces (i.e. the bedrooms). As such, I would create a personal "chill out" zone on the upper level or possibly two separate zones (one for each bedroom). So, some comfortable lounge furniture that is weather resistant along with any necessary plants for privacy screens. I would simply choose plants which will grow to a suitable height in planter pots and which will tolerate constant exposure.

As for the lower level, I would again think about how you entertain. Do you normally entertain formally at the dining table or informally sitting around on sofas. Whatever your preferred entertaining style, I would reflect that in the furniture chosen for the lower level. It appears as though you have substantial indoor living space so it's not a matter of including an outdoor dining table because you don't have room for one indoors. Obviously, the furniture should be orientated to maximise the views for the greatest number of guests possible. The BBQ should be in the least desirable spot in terms of views and preferably somewhat sheltered. As with the upper level, if necessary, plants should be chosen for privacy screening.

Thank you very much for your advice, we have been struggling with the larger deck. The media room downstairs off lounge we are having to use as a 4th bedroom. We have a very limited budget for furniture etc so getting these areas right is vital. I very much appreciate your input.