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This article should help with that: https://www.gardeningknowhow.com/edible/fruits/gooseberries/growing-gooseberries.htm

Yes, you can grow gooseberries in containers as well, just make sure to provide the same growing requirements and adequate drainage. This article provide growing info: https://www.gardeningknowhow.com/edible/fruits/gooseberries/growing-gooseberries.htm I assume the pruning is for the raspberry plants. This article should help with that: https://www.gardeningknowhow.com/edible/fruits/raspberry/pruning-raspberry-bushes.htm

The following articles should help: https://www.gardeningknowhow.com/edible/fruits/gooseberries/gooseberry-maggot-control.htm, https://www.gardeningknowhow.com/plant-problems/pests/pesticides/using-bacillus-thuringiensis.htm

There should be no reason why you couldn't grow gooseberries in Oklahoma so long as their growing requirements are met. Gooseberries are best planted while still dormant, from early February through mid-March. They tolerate heavy soils, but will need good drainage, so you may want to consider planting them in a raised bed. Gooseberries are planted much like grapes, but they do not require as much space. Set the plants 4 feet apart in the row. Before setting plants, cut the tops back to 6 to 10 inches. Plants are also set slightly deeper than the soil line, so that the first branch starts just below the soil surface. This encourages a bushier growth habit. Gooseberries require plenty of moisture and will require regular irrigation. Mulch the plants to help retain soil moisture. This will also help keep soils cooler during the hot days of summer. Good cultivars for Oklahoma include ‘Poorman’, ‘Invicta’, and ‘Pixwell’.

Well, it will be interesting to see if the berries are any good. Since you don't have a particular variety (plants grown from seeds produced by a hybrid don't have predictable characteristics), there's no way to tell what size or color or taste the berries will have. The only way to tell is to try them as they get soft, and just before they get soft, to see how they taste. Here are a couple of articles with information on growing gooseberries: https://www.gardeningknowhow.com/edible/fruits/gooseberries/growing-gooseberries.htm
http://www.crfg.org/pubs/ff/gooseberry.html

If you did not get flowers at all, try adding a little phosphorous (e.g. bone meal). A lack of phosphorous will cause a lack of flowers. No flowers means no fruit.