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They will be seeds, once the pod has dried. You can either leave them on and harvest the seeds, or you can cut them off. Either way will be fine. This article will give you more information on the care of these: https://www.gardeningknowhow.com/ornamental/shrubs/yesterday-today-tomorrow/yesterday-today-tomorrow-plant.htm

This plant prefers a slightly acidic soil, a pH between 6.0-7. It is in the nightshade family and is poisonous if consumed.

The root system does not seem to be invasive, however the shrub can span up to 12 feet wide. So the problem will be keeping it manageable so close to the house. If you can manage to keep it pruned, then you may have no trouble, but I would recommend planting it a few feet from the wall at least. Just do your best to keep it pruned up.

Here is an article for more information on the shrub: https://www.gardeningknowhow.com/ornamental/shrubs/yesterday-today-tomorrow/yesterday-today-tomorrow-plant.htm

The best time is during spring, when it is mild and humid. Here is an article for more information: https://www.gardeningknowhow.com/ornamental/shrubs/yesterday-today-tomorrow/yesterday-today-tomorrow-plant.htm

At most, it should only take a month. Older seeds may take slightly longer, or may not even germinate at all if they were not stored properly. Any light potting soil, or peat moss mix will be just fine for starting these. Here is an article with a little more information: https://www.gardeningknowhow.com/ornamental/shrubs/yesterday-today-tomorrow/brunsfelsia-propagation.htm

Planting during the summer months can be more challenging. You will need to water your plant regularly until it is well established.

Keep a close eye on all newly planted perennials during the first growing season. Many new perennials die because they get too much or too little water. The soil around their roots should be moist, but not soaking wet, for the first two weeks. For the next two weeks or so, water when the soil 2 inches below the surface is dry to the touch. After that, check the garden soil once a week and water if the soil 3 or 4 inches deep is dry.

To establish durable, deep root systems water slowly and deeply rather than frequently and shallowly. A good rule of thumb is that many perennials grow well with 1 inch of water per week. The water can come from natural rainfall or from irrigation.