Sparring should be done once certain fundamentals are established. Things like:
The jab and cross
Basic defence work. Parrying jabs and crosses.
Basic head movement viz bobbing
Basic footwork. backwards, forwards, pivoting.
Then leading up to full blown sparring, there are sparring specific drills such as the defense drill, where one focuses on attack and the other on defense. Do one round and switch. Then sparring at half speed, and then finally full speed light / touch sparring.
I think the above can be achieved in 1 months time with some dedicated training and good mentorship.
Then over the course of the next few months, more tools can be added to the arsenal such as the various hooks, uppercuts, bodyshots, countering etc.
Simultaneously basic level hard sparring sessions can be introduced. Here you go back to the basics, focusing on jabs, crosses, good defence, basic head movement and footwork.