Dude. I played til lvl 100+. I didn't know how to unlock legends.
I was so desperate want to play caustic. But i don't know how. LOL!
Until S0 was over, I found out that you can unlock for free. LOL!
I've been playing all the basic characters and they are all good.
I might even say, better than those newer ones(legends).
I miss the lifeline revive block shield. (Was the block shield in S0?)
Level Up slowly, enjoy the basic legends 1st , as you accumulate points.
Unlock which ever you think you want to play, if its not good then you can go back to basic legends.
I unlock all the legends but I don't play them. LOL!
Look at 'ShivFPS', he mostly play on 'bangalore'. The basic legends.
Dude, eventually you will get there. Give it time.
I can tell you that I'm not good at FPS but I enjoy it.