A slow to moderate speed bouncing stroke. is a good stroke to introduce relatively early to the young student as it encourages bow hold flexibility which is important for later development.
Practising without the 2nd or 1st finger on the bow hold can help us examine the role of each finger on the bow and check whether tightness in one of the fingers is creating problems for our control. It is interesting when the bowhand works better without either the 1st or 2nd finger on the bow.
When practicing your spiccato challenge yourself and try starting up bow instead of down bow.