That cannot seriously be your best suggestion to OP to fix his beginnings of game supplies shortage. Your recommendation for getting coins was spot on, but then you veer off wildly regarding supplies. Disappointing.
Come on, re-read the OPs questions/comments & look at the pics he's provided of his city through different stages of improvement. He's obviously only at the basics of the simple fundementals (as an aside - absolutely nothing wrong with that, we all have to start somewhere). How exactly is he going to adequately understand, get & level a GB that is 10+ Ages above his current spot based on the fact his sparse city currently has (among other things) over 10 decorations, perhaps 4-5 supply buildings only (all Bronze Age), and zero GBs?
Sure it is. I don't know why I shouldn't suggest it, I did it very easily. I had my DT within a month of entering Iron Age in my secondary city. The goods were easy to find and cheap to buy, 300 fp if I recall correctly (fp came from recurring quest packs), and I had enough prints to build it from my guild hopping. But it shouldn't be taken in a vacuum. Solving the supply issue is only one piece of the overall puzzle. I figured out how to build my cities by reading the forums (specifically the guides) and looking at what made some cities very successful and powerful from day one. I made Zeus my first priority in Bronze Age to use my bar fp, then focused on CdM, Chateau, and DT in that order once in Iron Age. Only after I had those did I start going for the Arc and other buildings.
He is here asking questions, so he is obviously looking for guidance. That is much more than most people do, so I am trying to give advice as to what worked best for me. Whether he takes it or not is up to him. Getting DT and Chateau early caused my secondary city to explode compared to my main city where I didn't build DT. When HC came out they both equalized regarding supplies, but that early advantage still shows in my secondary city being much more advanced at an equivalent age. I learned from my first city, and applied that information into building my second one.
I see so many terrible cities that it sometimes gets depressing. Fortunately, a decent number of new player's look at my Iron Age cities and start asking how I did it. I try to help them all, and it's even gotten to the point that I have copy/paste text that I use to try and help them out. Some take my advice and prosper, some don't and do fine, and some don't and stagnate. Of course there is no one right way, and what everyone wants to get out of the game varies substantially, but understanding the options and knowing it is possible to do things most people don't normally do can go a long way towards making informed decisions.
My oldest city was only started during the Winter event a little over a year ago, and I'm quite proud about how far I've been able to take all of them in less than a year for the youngest to less than a year and a half for the oldest, and I didn't do it by following most of the conventional wisdom.