Q.What’s the plant for full sun
Flowers

You have many possibilities. Below are links to some options. They include annuals and perennials, shrubs and groundcovers. If you are starting from seed and new to this, go with annuals. They tend to be easier to start from seed and much faster to reach flowering stage. https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-6/plants-for-zone-6.htm
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-6/zone-6-flowers.htm
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-6/zone-6-ground-covers.htm