Hi Ben!!
Nice that you are getting to the paint!! "DY"? I can assume this is the dunklegelb set? It would not matter really as they all work similar in the sense that you control what and how you want the job to work out. These sets are great as you have everything you need all in one.
For starters, you do not need to use all of the color...use only what you like. I like using the Shadow, Dark, and/or mid tones and maybe a highlight. I may even go back and use a different color to re-shade something.
Take your time doing the shading. There is a couple schools of thought here...complete lower shadow as seen on the box with or with out the perspective of lighting. What I mean is the direction of the lighting as seen on the back of the box. You can see the directionality of the light from a certain direction. The second is to highlight the joints, panel lines corners - inside and outside.
Each layer after this are thin coats...even if you are not thinking you are covering, its just the precess.
The slowly build up as you go!
What I showed here was a base application but was applied the same way except I didn't really need more than 3 of the colors. You do not need to base coat like this...just something I like to do. Here I used the same process only making light coats to blend the color.
The Highlight can be sprayed on or selectively brushed as with the shine. While typing, I remembered I did had a shot of my 1/72 pz.III in DG.
This was four colors. To get the panel shading singled out as like on the turret, you can free hand it, use a stick note sheet, mask or whatever to cove the adjacent panel. This will give the sharp contrast between panels. Don't forget that lighter is better. There will be a point when you are looking at your piece when painting and say "wow, that is what I am looking for"...remember that you need the weathering. Things will darken, sometimes a lot depending on what and how you apply the weathering.
Of course the camo covered a lot of this, you can see how things darken. Looking forward to you having at the III!!! Test out the layers with a drop or two shot on to a white piece of paper of card stock...play and have some FUN!!!