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While it is oftentimes a good idea to allow seeds to dry beforehand, you don't need to dry the seeds to grow them. You really only need to dry them if you plan on storing them. You can plant them as soon as they come out of the pepper.

The following articles should be of some help to you:
https://www.gardeningknowhow.com/edible/vegetables/pepper/common-pepper-plant-problems.htm
https://www.gardeningknowhow.com/edible/vegetables/pepper/growing-peppers.htm

They may have wilt. Peppers are susceptible to the same wilts that tomatoes get. This article will have more about them:
https://www.gardeningknowhow.com/edible/vegetables/tomato/wilting-tomato-plants.htm

While generally considered perennials (with overwintering in cold regions), bell peppers are generally grown and treated as annuals. In warmer locations that are frost free, it is possible, wtih pruning, to extend their lifespan, though doing so doesn't offer any special rewards. Generally, after 6 months, the plants begin to look ragged.

Normally when you see lots of foliage and little flowers/fruit, this is an indicator of too much nitrogen and too little phosphorus. Use bone meal to add phosphorus. That should fix it. This article has other information:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm

They grow best in loose, organic-enriched, well-draining soil. This article will help: https://www.gardeningknowhow.com/edible/vegetables/pepper/growing-peppers.htm