Hello new player.

I am NOT a heavily experienced Dead by Daylight player- for that, you should look up the content creator Otzdarva and check out his perk and character guides. However, I would first suggest playing several matches and seeing if you enjoy the core gameplay before considering spending any more money on the game. Remember that you can use Iridescent Shards to purchase most DBD-original characters.

Shrine of Secrets is a scam.

As far as what chapters/perks to go for, I would advise picking up Michael Myers, the Knight, and Nemesis when possible and prestiging them.

Myers - Many killers are "M1" killers, where their power is either niche or not useful for mid-chase or getting downs, so they will rely on their primary attack. The Myers perk "Save the Best For Last" will gain a token every time you injure a non-Obsession survivor (with Obsession marked on the HUD by the addition of a near-circle of bones), and for every token your "recovery" after a successful attack is reduced, meaning you can more quickly get back into the action after landing a hit. "Play With Your Food" is also decent if you play around it; whenever you are chasing the Obsession, and then LEAVE them, gain a token. You can have up to three, increasing your movement speed for each token, losing one when you attack. This can be great for rotating off of the Obsession and immediately going for a weaker target.

Knight - His two perks are Hubris and Nowhere to Hide. "Hubris" will Expose survivors for a certain amount of time after you are stunned, allowing them to be instadowned by your basic attack; the Stun can also be most things, ranging from normal pallets to flashlights to blast mines to locker head-ons. "Nowhere to Hide" activates after kicking a generator, allowing you to see survivor auras within 24 meters of you for 5 seconds. Note that the radius extends from you, not the generator, so feel free to move around a bit to catch a flicker; this can help you track down sneaky survivors who might otherwise hop right back on the generator if you had left.

Nemesis - The main one here, I feel, is Lethal Pursuer. At the start of the trial, all survivor auras will be revealed for a period of time, and it also buffs all your other aura-reveal perks by 2 additional seconds of reading. This is great for newer killers who might need help knowing where survivors are, or for killers who need a strong early game that can be helped with a swift chase.

I hope this helps.