Congratulations on the very nice build, you have done a fantastic job.
Firstly, on the decals - tricky. That is a very unique scheme and you will not find anything "off the shelf" I expect. It depends a bit on how much you want to spend. If you have access to a good printer you could have a go at making your own with decal paper. Alternatively, you could get some decals custom made for you by someone like Callie Graphics. Callie is a real peach - very helpful and skillful and reasonably priced. All you have to do is provide her with pics of what you want and scale info. Also, check with her to see what she has in stock as she is building up a huge library of graphics for a variety of models - much more than is shown on the website. Sometimes, I have finished off planes very cheaply just using decals she has readily available. Maybe get the model flying well before putting too much work into finishing it off??
On the painting front, if you are using Monokote, then Lustrekote is the paint to use. Have a hunt around for the nearest supplier: