First thing you can try is to rescue the ones you still have. You need a bottle of microscale liquid decal film. Then brush on a light coat over each decal image and let it dry. Then, carefully, you can use them as normal. This puts a thin film on top of the images to create a skin and hold them together for you.
The printer you have should be fine if you tried to print your own decals. You need to find the decal paper for printers. It's not the same decal paper. You will need to decide what type of paper too. Clear or white? If you need white, remember printers don't print white. Normal decal paper will have the inks 'puddle' up on the paper. But after that you will need to coat the images with a clear coat. Most printer inks are water based, so...... Again, you should have the microscale liquid decal film for this. You can use a clear laquer to top coat them also. Don't use an acrylic clear for the decals. I think you see where that will wind up. Hope it helps a bit.