The best way to help your child with spelling at this stage of their development is to say CVC or CVCC words and ask your child what sounds they can hear (segmenting) or you sound out the word and they say what word is you have sounded out (blending)
Example of CVC words - cat/log/den etc
Example of CVCC words - bent/skip/step/frog
Questioning what sound can you hear at beginning/middle/end of the word?