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And what do you recommend I replace?

Should I get any of the other Planeswalkers

So I just got into Magic when I got the Infernal Intervention pack for Christmas. I wanted to build a deck around the boss known as, "Indulgent Tormentor", and the ideal deck to run is Mono Black. Problem is that I dont exactly what to do as far as making this deck work. I only have the cards from the intro deck and some cards my friend traded atm. Please remember that I just got into the game and I don't know what most cards do. Ik the deck is incomplete, but can someone please help me build a good mono black deck. Thanks
Lands:
24 Swamp
1 Nykthos, Shrine to Nyx
Creatures:
4 Typhoid Rats
1 Gravedigger
4 Marshdrinker Giant
2 Carrion Crow
1 Brain Maggot
3 Kheru Bloodsucker
2 Spiteful Returned
2 Necropolis Fiend
2 Gray Merchant of Asphodel
1 Indulgent Tormentor
1 Abhorrent Overlord
Spells:
2 Pharika's Cure
1 Caustic Tar
2 Flesh to Dust
1 Bile Blight
1 Festergloom
1 Stab Wound
2 Stain the Mind
2 Dead Drop

[First MTG Deck (Mono Black aggro)]

First MTG Deck (Mono Black aggro) 60 cards, 0 sideboard 24 {Swamp} 1 {Nykthos, Shrine to Nyx} 25 lands 4 {Typhoid Rats} 1 {Gravedigger} 4 {Marshdrinker Giant} 2 {Carrion Crow} 1 {Brain Maggot} 3 {Kheru Bloodsucker} 2 {Spiteful Returned} 2 {Necropolis Fiend} 2 {Gray Merchant of Asphodel} 1 {Indulgent Tormentor} 1 {Abhorrent Overlord} 23 creatures 2 {Pharika's Cure} 1 {Caustic Tar} 2 {Flesh to Dust} 1 {Bile Blight} 1 {Festergloom} 1 {Stab Wound} 2 {Stain the Mind} 2 {Dead Drop} 12 other spells Sideboard Notes: This is my first MTG Deck. I got the Infernal Intervention Intro deck for Christmas and have just started Magic. The deck needs much improvement