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This article will help: https://www.gardeningknowhow.com/edible/vegetables/rhubarb/grow-rhubarb.htm

It depends on the variety. Some varieties should be red when harvested, while others should be harvested when green because the stalks never turn red. If you have a red variety, wait until the stalks are red to harvest. Here is an article that you may find helpful: https://www.gardeningknowhow.com/edible/vegetables/rhubarb/harvesting-rhubarb.htm

You can apply manure, compost, or a low nitrogen fertilizer to the soil surrounding the plants in spring.

Yes, these plants typically thrive in full sun but may tolerate partial shade. This article may help: https://www.gardeningknowhow.com/edible/vegetables/rhubarb/grow-rhubarb.htm

First, some basic information on harvesting rhubarb: https://www.gardeningknowhow.com/edible/vegetables/rhubarb/harvesting-rhubarb.htm
Information on storing and cooking should be here: http://www.rhubarbinfo.com/culinary