Like I said try a few, but you should learn how to play at least 2 characters to their fullest, you'll only know who you like by trying them, they all have different properties;
Some are fast and rely on being agressively played while using longer combos and jugles to make big damage
Some are slow and are grab characters
Some have more projectiles than others, some high low, mid and air projectiles
Some are ultra defensive/turtle characters who rely on the opponent making a mistake in order to punish them
Some are slow and do more damage
As a starter find a character who at least has a teleport, that way you aren't being forced into a certain space to play as a certain style, it also allows you to break away from being trapped...Characters that don't have a teleport take alot more skill, since their skill-sets only allow you to play well with said characters zoning and spacing; you can actually lose matches because you can't control the space that specific character needs in order to excel, more options are better for beginners.
So try a few out and decide what type of player you are, rush down, defensive, mixup/jack of trades, punisher, big damage defensive player...