Latte: Froth your milk (i’m assuming as you say you’re good at the esp. machine, you know how to do this) and add shots of espresso, I use 1 for 12 oz, 2 for 16 os, 3 for 20 oz.

Mocha: Make a latte, add your desired amount of chocolate I use 1 oz for 12 oz drink, 2 oz for a 16 oz drink, and 2.5 oz for a 20 oz drink. Also, I prefer Ghiradelli sweet powdered cocoa.

White Mocha: same as above, just use white chocolate

Also, you can add flavored syrups (in the same amounts as the cocoa), I use torani or monin, to make a drink like a vanilla latte.

If you want to make a blended drink:
Latte: 16 oz cup of ice, 2 shots espresso, splash of milk, scoop of vanilla frozen yogurt or ice cream. Blend until smooth. If you dont want fro-yo or ice cream, add a little more ice.

Add chocolate in the same proportions as above is you want a mocha version.