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If it was from a seed that you got from an avacado bought from the store, it will likely not produce fruit. The avocados sold in groceries are a variety that is grafted and does not fruit well unless it is grafted.

Leave a little of the pit out of the soil. The curved leaves usually indicate a watering problem. Water the plant when the top of the soil feels dry to the touch. This should clear up the curled leaves.

This is caused by a fungus, likely black spot fungus. Treat the tree with a fungicide. This will help clear it up.

Please send a picture of the plant. Then we can identify it and give you the best advice on how to propagate it.

You simply need to harden it off some, or acclimate it, to the outdoors by slowly introducing light. Start it out in bright but indirect light (like a bright, shady location) for a few hours each day and then eventually give it more light and more time outside. Within a few weeks, it should be fine to remain outdoors day and night and will enjoy the sunlight. Here is more information that will help: https://www.gardeningknowhow.com/houseplants/hpgen/move-houseplant-outside.htm
https://www.gardeningknowhow.com/houseplants/hpgen/acclimating-houseplants-outdoors.htm
https://www.gardeningknowhow.com/garden-how-to/seeds/how-to-harden-off-your-seedlings.htm

This indicates a watering issue. Either the tree is not getting enough water or there is something affecting the roots that is preventing the roots from taking up water.

If your tree is potted, you should check for root rot:
https://www.gardeningknowhow.com/plant-problems/disease/treating-root-rot-gardening-tips-for-housplants.htm

If you don't find root rot, increase water to the tree.