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If you go to a website called http://www.helpmefind.com and do a search for Celebration or Carnival roses, you should come up with some photo examples. Also an on-line search may help.

Carnival roses are typically the same as the Parade rosebushes. Here is an article for you:
https://www.gardeningknowhow.com/ornamental/flowers/roses/how-to-care-for-parade-roses-outdoors.htm

Here is another article that may be of help to you as well:
https://www.gardeningknowhow.com/ornamental/flowers/roses/sunblaze-miniature-rose-bushes.htm

If over watering is the problem, perhaps see if you can build something that will deflect the water and slope the garden soils so that water that does make it to them will run away better. Then I would suggest feeding the rosebushes with a good organic based rose food, such as Gro Rich Rose and Perennial Food. That will feed both the bush and build the soils home for the root system. Some Super Thrive and Root Stimulator mixed in some water given to each rosebush a couple times early on will give them a nice start too. I also give my roses 1/2 cup Epsom Salts each year, scratched into the soils and watered in well.

The condition you describe can be either frost/winter kill or rose canker. In both cases, you prune the rose down as far as you have to in order to get to a good whiteish colored center pith of the canes. Seal the ends of the canes with white Elmer's glue or Tacky Glue from a craft store. They spray the canes area and soil around them with a good fungicide such as Immunox or another good fungicide of choice. Many rosebushes die back over the winter in cold climates. Many times I have had to prune my rosebushes down to within an inch of the ground. They come back nicely every year with a little fertilizer, water and the warm sunshine to call them forth! Here is a link to an article with more information to help you if it is rose canker:
https://www.gardeningknowhow.com/ornamental/flowers/roses/rose-canker-fungus.htm

The condition you describe sounds like rose canker fungus. Prune the rose canes back to where you get a good whiteish colored center pith of the canes. Seal the ends of the canes with white Elmer's glue or Tacky Glue from a craft store. Then spray the canes area and soil around them with a good fungicide such as Immunox or another good fungicide of choice. If the rosebush is healthy it will usually overcome the canker fungus with just a little help. Be sure to wipe your pruners off with a Clorox or Lysol Wipe after each pruning cut on the blackend canes so as not to spread the problem to other canes or rosebushes. Here is a link to an article with more information to help you if it is rose canker:
https://www.gardeningknowhow.com/ornamental/flowers/roses/rose-canker-fungus.htm

Keep the roses well watered and fed. Even give them some water with a product called Super Thrive in it. It helps the rosebush deal with the stress of a fungal attack and other stresses. Water them two or three times with the Super Thrive in the water, you can add some water soluable fertilizer in it too.

Well the white spots could be Powdery Mildew and spraying them with a product known as Green Cure is the best remedy for handling it that I know of. It is available on-line at a website called Planet Natural. Powdery mildew will start out with white spots sometimes before it takes over the entire leaf and spreads. If you watch the white spots and they move, it could be mealy bugs and or could be egg sacks from a spider too.

Here are some links to articles of help for you as there are some other things it could be:

https://www.gardeningknowhow.com/ornamental/flowers/roses/roses-powdery-mildew.htm

https://www.gardeningknowhow.com/ornamental/flowers/roses/spot-anthracnose-roses.htm

https://www.gardeningknowhow.com/plant-problems/pests/spider-mite-detection-and-spider-mite-natural-control.htm

https://www.gardeningknowhow.com/plant-problems/pests/mealybugs-white-residue-on-plants-leaves.htm

Stan The Rose Man
Consulting Rosarian
Gardening Know How

You will want to let the rose seeds go through at least 2 to 3 months of cold. Such as placing them in the refrigerator for a while. Then plant them in some seed starting soil to get them to growing. Once they come up you can tell fairly quickly which ones are too weak and will not take off. Cull those out and concentrate on the more hardy ones. Once they start growing well and have several leaves you can move them to medium sized pots. After they have produced some buds and blooms, it is likely time to move them out to the rose bed or garden. Or perhaps just to a larger pot to enjoy them. Here is a link to an article for you too:

https://www.gardeningknowhow.com/ornamental/flowers/roses/growing-roses-from-seed.htm

Stan The Rose Man
Consulting Rosarian
Gardening Know How