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i have a hydrangea too but still new. i read alot about how to turn it into blue. the soil must be acidic. to add aluminum sulphate is the trick. when the soil is more alkaline the flowers will be pink. ask the stores for this element it is what will turn the hydrangea into blue although i havent tried it yet. mine is pinkish and has just one flower, but the leaves r plenty and big ones look healthy too.

This article will help you: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-not-blooming.htm

This is a sign that the plant is not getting quite enough water. Hydrangea tend to need a bit more water than other plants, especially if they are planted in the sun. Increase water to the plant and that should get rid of the brown edges on new leaves.

The soil around the hydrangea may be lacking in phosphorus. That can affect the ability of the plant to bloom. Adding some bone meal in the soil should help alleviate the problem in the future. These articles will help you learn more (if you haven't already read them):
https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-not-blooming.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm

As for fertilizing and pruning, these articles should help you: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/fertilizing-hydrangeas.htm
https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/prune-hydrangea-bushes-hydrangea-pruning-instructions.htm

Yes, that should work.