Karate Kumite or fighting all starts to come together when you have learned a set of the basic karate techniques and then are able to combine those together into simple combinations for defence and attack.
Learning Karate from home may make kumite practise harder than attending a Dojo unless you can ( and we do recommend) learning with another person.
When on your own take a few moves e.g. fighting stance, with outer and/or lower block then a reverse punch. Bouncing on the spot loosely practise foot work while using a defending block then gradually add in a reverse punch advancing slightly. Vary your blocking and punching height. Check out the Kumite techniques from these instructors.
NB:If with a partner – Safety is paramount! Do not put full power in, it should be loose and controlled practise.