I have 5 two year olds in my daycare/school. The word "lessons' hits me the wrong way, but I think I know what you mean. You've gotten a lot of good suggestions so far. It sounds like what you're looking for is a lesson plan for you to follow so that you have a better structure and more ideas to go by...?
Do remember that kids at this age learn best through play. Almost anything you do throughout the day is an opportunity for teaching and learning. Your awareness of what your son doesn't know and talking to him about what you observe are good lessons. Offering new experiences with regard to places, activities and other people and children are good lessons.
Some of the things that we do in a typical day are: (small motor skills), playdoh, puzzles, legos, bristle blocks, wooden blocks, "feeding" Mr Tennis Ball (which is a tennis ball with a cut along the seam, and a face drawn on so when you squeeze it it looks like he's opening his mouth.... then the kids "feed" him with small beads ), coloring with small chalk and crayons (we break them to encourage correct pencil grip for handwriting later). Trace and play in different materials; corn meal, shaving cream, birdseed... scooping and pouring (water, rice, birdseed etc...) Using small tongs to pick up different things and transfer them to another container. Ripping paper.
(Large motor skills) running, jumping climbing, balancing, dancing.
We do have a circle that lasts about 20 minutes. We do LOTS of teaching through songs. All of my kids know their colors, the days of the week, their parent's names, and lots of rhyming songs and finger plays. We also read books, work on letter recognition and sound (through songs).
We go outside every day, whether it's a wagon ride, playing at the park, playing in my backyard, or just a walk in the neighborhood. We talk about the weather, the wind and clouds, the seasons, sun prints, dig in the sand, play in sensory boxes I make, or sensory bottles, parachute play, group games, chase, kick balls, play catch, hunt for (plastic) bugs or other things I hide in the yard. Observe animals and bugs.
We play with musical instruments; some are bought, some we make, dress up, dramatic play where we act out stories or pretend play with dolls or toys. We do lots of art; glueing, painting on a table (using different materials; brushes, feathers, sponges, q-tips, handprints made into elephants, ducks, trees..., foot prints, and easel with brushes using different kinds of paints, finger-painting. "painting the fence" with brushes and water.
Because we have a group of children we also work a lot on sharing, using your words to ask for things or express feeling, labeling feelings...
There are so many fun things to do that don't even seem like lessons or teaching. if you keep that in mind with your interactions with your kiddo, you'll do just fine!!