I'm having problems with footwork

Can you guys give any tips? I can state few problems I have: 1. I'm not exactly sure how long the steps should be. I'm always afraid that I either take too long steps or too short steps. My coaches corrected me in the beginning when I jumped way too much, I jumped more than Amir Khan when he closes the distance. I've shortened the step but I still don't feel comfortable with the step. I don't know if it's bad because it's too short or too long, I just know it isn't optimal. I haven't had time to go to the gym recently so I'm asking here. 2. How to sync the punches and the footwork? I always feel like I either start doing hopping punches when I don't get the rhythm but I need to close the distance or then I'm overreaching with my hand to make up for the lack of footwork. Often when I do 1-2-3 I throw the jab but I can't get the rhythm so I jump to close the distance and throw the 2-3 flat footed because I ruined my balance by the jump. What would be corrective method? 3. Are here any other boxers who have huge problems throwing cross while moving? When I throw 1-1-2 I get the jabs done but when I throw the cross I lose my stance (my feet are very far away as the back leg doesn't stay in the rhythm).