3D printed resin parts are supported by was webs during the build, this is then cleaned off when the print is finished, but I strongly advise cleaning the parts in warm soapy water and if your wife has an ultra sonic jewellery cleaner then use that as well.
For painting I have found that acrylic paints give the best finish.
Most 3D printing places will act as agencies and will print your 3D models, you will usually have to supply them in a 3D STL file format. If you have drawings or good photos and know the major dimensions, I can draw them up and produce the 3D models to most scales, but be warned the bigger they are the more they cost due to material and print run times.
Mark