Of course, firstly, you should know the numbers of the basic punches inside out. These are jab (1), cross (2), left hook (3), right hook/rear hook (4), left uppercut (5), right uppercut (6). Then, start with basic punch combinations such as 1-2. When I started, I wrote the combos on a big piece of paper and fixed it on the wall. And, I practiced a lot. These days I use an application that calls out punches.