I am trying to add plugins like in this script which I found on YT

here is the link to that .zshrc link
below is my attempt without using zinit

# Enable Powerlevel10k instant prompt. Should stay close to the top of ~/.zshrc.
# Initialization code that may require console input (password prompts, [y/n]
# confirmations, etc.) must go above this block; everything else may go below.
if [[ -r "${XDG_CACHE_HOME:-$HOME/.cache}/p10k-instant-prompt-${(%):-%n}.zsh" ]]; then
  source "${XDG_CACHE_HOME:-$HOME/.cache}/p10k-instant-prompt-${(%):-%n}.zsh"
fi

if [[ -f "/opt/homebrew/bin/brew" ]] then
  eval "$(/opt/homebrew/bin/brew shellenv)"
fi

source $(brew --prefix)/share/zsh-autosuggestions/zsh-autosuggestions.zsh
source /opt/homebrew/share/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh
source /opt/homebrew/share/powerlevel10k/powerlevel10k.zsh-theme

autoload -U compinit; compinit

# To customize prompt, run `p10k configure` or edit ~/.p10k.zsh.
[[ ! -f ~/.p10k.zsh ]] || source ~/.p10k.zsh

source ~/Documents/fzf-tab/fzf-tab.plugin.zsh



bindkey "^[[A" history-search-backward
bindkey "^[[B" history-search-forward

HISTFILE=$HOME/.zhistory
SAVEHIST=5000
HISTSIZE=5000
HISTDUP=erase

setopt appendhistory
setopt sharehistory
setopt hist_ignore_dups
setopt hist_ignore_all_dups
setopt hist_save_no_dups
setopt hist_find_no_dups


zstyle ':completion:*' matcher-list 'm:{a-z}={A-Za-z}'
zstyle ':completion:*' list-colors "${eza}"
zstyle ':completion:*' menu no
zstyle ':fzf-tab:complete:cd:*' fzf-preview 'eza $realpath'
zstyle ':fzf-tab:complete:__zoxide_z:*' fzf-preview 'eza $realpath'


alias cd='z'
alias ls="eza --icons=always"
alias c='clear'

eval "$(fzf --zsh)"
eval "$(zoxide init zsh)"
eval $(thefuck --alias)
eval $(thefuck --alias fk)

Everything in my script is working well except the fzf-preview part, I am unable to figure out what I am doing wrong.