diff --git a/Cargo.lock b/Cargo.lock
index f804dcd..b64bd72 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,236 @@
 # It is not intended for manual editing.
 version = 3
 
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+ "anstyle",
+ "anstyle-parse",
+ "anstyle-query",
+ "anstyle-wincon",
+ "colorchoice",
+ "is_terminal_polyfill",
+ "utf8parse",
+]
+
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+ "windows-sys",
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 [[package]]
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+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
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diff --git a/Cargo.toml b/Cargo.toml
index b8ebe8a..dccebc1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,3 +4,4 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+clap = { version = "4.5.13", features = ["derive"] }
\ No newline at end of file
diff --git a/src/cli.rs b/src/cli.rs
new file mode 100644
index 0000000..d3f2d3d
--- /dev/null
+++ b/src/cli.rs
@@ -0,0 +1,39 @@
+use clap::{Args, Subcommand, Parser};
+
+#[derive(Args)]
+pub struct DaemonArgs {
+}
+
+#[derive(Parser)]
+#[clap(name = "sand", about = "Command line countdown timers that don't take up a terminal.", version)]
+pub struct Cli {
+    #[clap(subcommand)]
+    pub command: CliCommand,
+}
+
+#[derive(Subcommand)]
+pub enum CliCommand {
+    /// Start a new timer for the given duration
+    Start {
+        #[clap(name = "DURATION", num_args = 1.., value_delimiter = ' ')]
+        duration: Vec<String>,
+    },
+    /// List active timers
+    #[clap(alias = "list")]
+    Ls,
+    /// Pause the timer with the given ID
+    Pause { 
+        timer_id: String 
+    },
+    /// Resume the timer with the given ID
+    Resume { 
+        timer_id: String 
+    },
+    /// Cancel the timer with the given ID
+    Cancel { 
+        timer_id: String 
+    },
+    
+    /// Launch the daemon
+    Daemon(DaemonArgs),
+}
\ No newline at end of file
diff --git a/src/client.rs b/src/client.rs
new file mode 100644
index 0000000..e6b6d03
--- /dev/null
+++ b/src/client.rs
@@ -0,0 +1,28 @@
+use crate::cli;
+
+pub fn main(cmd: cli::CliCommand) {
+    match cmd {
+        cli::CliCommand::Start { duration } => {
+            let duration_str = duration.join(" ");
+            println!("Starting new timer for duration: {}", duration_str);
+            // Implement timer creation functionality
+        }
+        cli::CliCommand::Ls => {
+            println!("Listing timers...");
+            // Implement list functionality
+        }
+        cli::CliCommand::Pause { timer_id } => {
+            println!("Pausing timer {}...", timer_id);
+            // Implement pause functionality
+        }
+        cli::CliCommand::Resume { timer_id } => {
+            println!("Resuming timer {}...", timer_id);
+            // Implement resume functionality
+        }
+        cli::CliCommand::Cancel { timer_id } => {
+            println!("Cancelling timer {}...", timer_id);
+            // Implement cancel functionality
+        }
+        cli::CliCommand::Daemon(_) => unreachable!(),
+    }
+}
\ No newline at end of file
diff --git a/src/daemon.rs b/src/daemon.rs
new file mode 100644
index 0000000..f90973f
--- /dev/null
+++ b/src/daemon.rs
@@ -0,0 +1,6 @@
+use crate::cli;
+
+pub fn main(_args: cli::DaemonArgs) {
+    println!("Starting sand daemon ");
+    // Implement daemon functionality
+}
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index 69eadc7..730f78d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,11 +1,16 @@
-use std::env;
+use clap::Parser;
+use cli::CliCommand;
+
+mod client;
+mod daemon;
+mod cli;
 
 fn main() {
+    let cli = cli::Cli::parse();
 
-    let args: Vec<String> = env::args().collect();
-    if args.len() > 1 && args[1] == "version" {
-        println!("Sand v0.3.0: rewrite it in Rust");
-    } else {
-        println!("Hello, world!");
+    match cli.command {
+        CliCommand::Daemon(args) => daemon::main(args),
+        _ => client::main(cli.command),
     }
-}
+    
+}
\ No newline at end of file
diff --git a/src/sand.rs b/src/sand.rs
new file mode 100644
index 0000000..e0a64e2
--- /dev/null
+++ b/src/sand.rs
@@ -0,0 +1,9 @@
+// This module will contain common functionality and message wire format
+
+pub enum Message {
+    // Define your message types here
+}
+
+// Implement serialization/deserialization for Message
+
+// Other common functionality...
\ No newline at end of file