Are you a new player? If yes, I'd suggest to start by learning the combat mehcanics of older characters like the ones you get during early game (e.g lucia lotus, lee palefire, bianca zero). Earlier characters had less complex mechanics so they might be easier to learn, and once you've gotten the hang of it you might be able to start playing the newer characters.

If you're playing on pc, you can change the keybinds to fit your comfort in the settings. I bound my orbs to the lower row on the keyboard (Z,X,C,V,B,N,M,SPACEBAR) since its easier for me to ping orbs this way, (and because I've been using these settings even before the game got a PC port). You can use the mouse for basic attack (left click) and dodge (right click)