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This article will help with growing a Camellia.

https://www.gardeningknowhow.com/ornamental/flowers/camellia/caring-for-camellias.htm

The important thing to know about these seeds is that you should not let them dry out before you plant. Also they should be soaked for 12 hours prior to planting. This article will help you further: https://www.gardeningknowhow.com/ornamental/flowers/camellia/growing-camellias-how-to-propagate-camellias.htm

That mix would do best for vegetative growth, with the added benefit of sulfur. I would suggest for flowering that you find something high in P (phosphorus) and K (potassium), as these will support the blooms during bloom season.

As a homeowner, I'm always concerned when someone posts that the soil next to the house is wet. If you don't have gutters or your downspouts don't carry water a sufficient distance from the house, that would explain the wetness. The other factor is whether the grade runs downward toward your house instead of away. Since I don't know where you live, I can't make specific plant recommendations. I suggest you look online at your state's "extension service". You will find suggestions for plants that do well in your area. Here is an article discussing wet shade. http://www.finegardening.com/solutions-wet-shady-sites

This can happen because of either too much nitrogen, or not enough phosphorus and potassium. They tend to offset each other. Apply fertilizers high in potassium and phosphorus, and it should begin to bloom again. This link will give you more information for their care: https://www.gardeningknowhow.com/special/organic/

These can be sensitive to change. Unfortunately, they can drop off due to a number of reasons including over-watering, under-watering, underfertilization, over-heating, and cold weather. This article will give you more information: https://www.gardeningknowhow.com/ornamental/flowers/camellia/camellia-flowers-not-opening.htm