Piece counts vary by expansion. In the available options they range from as few as 4 pieces up to about 190 pieces, depending on the set.
Most expansions include an instruction guide or manual. Descriptions often specify that instructions are provided, but check the specific product listing for full details.
Product details indicate that sets and elements are compatible and can be combined across the system—starter sets, electronic elements, and other expansions are described as interoperable. Check individual product descriptions for any exceptions.
