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Here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/shrubs/rhododendron/pruning-rhododendrons.htm

This phenomenon occurs in species and hybrids of rhododendrons, including evergreen and deciduous azaleas. No one really knows for certain what causes this to occur. However, it's been suggested that environmental conditions, perhaps a period of dry weather in late summer followed by a period of rain and then warmer weather stimulates the plants. Therefore, keeping plants adequately watered throughout the growing season may help prevent fall blooming.

These articles should help: https://www.gardeningknowhow.com/ornamental/shrubs/rhododendron/rhododendron-care.htm
https://www.gardeningknowhow.com/ornamental/shrubs/rhododendron/pruning-rhododendrons.htm

Perennial geraniums and rhododendrons can grow together if they have the right conditions. Perennial geraniums like full sun to part sun and rhododendrons like part sun to shade, so as long as you are planting in an area that gets part sun, both plants will be happy.

How much space you will need depends on the size of the rhododendron you buy. They come in different sizes and the tag or the nursery worker should be able to tell you what size the variety you want will grow to be. Conversely, if you have a space in mind, a good nursery should be able to point you in the right direction to a rhododendron that is the size you need.

Perennial geraniums are much smaller than most rhododendrons, so their size does not have to be factored in. They would be perfectly happy near the base of the rhododendron.

Used coffee grounds are good for Rhododendrons and Azaleas. Actually, banana peels are great for any flowering plant.

Is the curled leaves something that happened over the winter? If so, then it is possible the plant had a severe case of winter burn. The wind, cold and sun in the winter can kill the leaves on the plant if it is not protected.

If this leaf damage was there prior to winter, then it is likely fungus or pests. You should treat the plant with a fungicide and a pesticide. I personally like neem oil as it does both and is organic.