Help starting own toddler group ideas.

Hello I am a qualified teacher looking at starting my own toddler class in my local area.

i have a few ideas and just wanted some feedback on which one you would prefer or would spend money on.

1-A letters and sounds interactive class which helps children ages 2-5 learn letters and mark make. Class would be very hands on and lots of sensory activities.

2-Messy play Class.

3-a science toddler class Where children wear lab coats and learn about different science concept and hands on investigations and activities.

Thank you.