diff --git a/env.go b/env.go
index c7bac4b..e213e31 100644
--- a/env.go
+++ b/env.go
@@ -1,50 +1,163 @@
 package config
 
-import "errors"
+import (
+	"errors"
+	"fmt"
+	"time"
+)
 
-type ConfigManager struct{}
+type ConfigType string
 
-var ConfigFileNotFoundError = errors.New("config File Not Found")
+const (
+	ConfigTypeTOML ConfigType = "toml"
+	ConfigTypeYAML ConfigType = "yaml"
+	ConfigTypeJSON ConfigType = "json"
+)
+
+type ConfigManager struct {
+	configFileUsed string
+	configType     ConfigType
+	autoEnvEnabled bool
+	envPrefix      string
+	mapConfig      map[string]any
+	defaultConfig  map[string]any
+}
+
+var (
+	ErrConfigFileNotFound = errors.New("config File Not Found")
+	defaultConfigManager  = NewConfigManager()
+)
 
 func NewConfigManager() *ConfigManager {
 	return &ConfigManager{}
 }
 
-func AutoMaticEnv() {
+func AutoMaticEnv(enabled bool) {
+	defaultConfigManager.autoEnvEnabled = enabled
 }
 
-func ConfigFileUsed() {
+func (c *ConfigManager) ConfigFileUsed() string {
+	return c.configFileUsed
 }
 
-func GetDuration() {
+func ConfigFileUsed() string {
+	return defaultConfigManager.ConfigFileUsed()
 }
 
-func GetString() {
+func (c *ConfigManager) GetBool(key string) bool {
 }
 
-func GetStringMap() {
+func GetBool(key string) bool {
+	return defaultConfigManager.GetBool(key)
 }
 
-func GetStringSlice() {
+func (c *ConfigManager) GetDuration(key string) time.Duration {
 }
 
-func ReadInConfig() {
+func GetDuration(key string) time.Duration {
+	return defaultConfigManager.GetDuration(key)
 }
 
-func SetConfigFile() {
+func (c *ConfigManager) GetString(key string) string {
 }
 
-func SetConfigName() {
+func GetString(key string) string {
+	return defaultConfigManager.GetString(key)
 }
 
-func SetConfigType() {
+func (c *ConfigManager) GetStringMap(key string) map[string]any {
 }
 
-func SetDefault() {
+func GetStringMap(key string) map[string]any {
+	return defaultConfigManager.GetStringMap(key)
 }
 
-func Set() {
+func (c *ConfigManager) GetStringSlice(key string) []string {
+}
+
+func GetStringSlice(key string) []string {
+	return defaultConfigManager.GetStringSlice(key)
+}
+
+func (c *ConfigManager) GetInt(key string) int {
+}
+
+func GetInt(key string) int {
+	return defaultConfigManager.GetInt(key)
+}
+
+func (c *ConfigManager) GetIntSlice(key string) []int {
+}
+
+func GetIntSlice(key string) []int {
+	return defaultConfigManager.GetIntSlice(key)
+}
+
+func (c *ConfigManager) ReadInConfig() error {
+	return nil
+}
+
+func ReadInConfig() error {
+	return defaultConfigManager.ReadInConfig()
+}
+
+func (c *ConfigManager) SetConfigFile(file string) {
+	c.configFileUsed = file
+}
+
+func SetConfigFile(file string) {
+	defaultConfigManager.SetConfigFile(file)
+}
+
+func (c *ConfigManager) SetConfigName(name string) {
+}
+
+func SetConfigName(name string) {
+	defaultConfigManager.SetConfigName(name)
+}
+
+func (c *ConfigManager) SetConfigType(configType string) error {
+	switch configType {
+	case "toml":
+		c.configType = ConfigTypeTOML
+	case "yaml":
+		c.configType = ConfigTypeYAML
+	case "json":
+		c.configType = ConfigTypeJSON
+	default:
+		return fmt.Errorf("config type %s not supported", configType)
+	}
+	return nil
+}
+
+func SetConfigType(configType string) error {
+	return defaultConfigManager.SetConfigType(configType)
+}
+
+func (c *ConfigManager) SetDefault(key string, value any) {
+}
+
+func SetDefault(key string, value any) {
+	defaultConfigManager.SetDefault(key, value)
+}
+
+func (c *ConfigManager) SetEnvPrefix(prefix string) {
+}
+
+func SetEnvPrefix(prefix string) {
+	defaultConfigManager.SetEnvPrefix(prefix)
+}
+
+func (c *ConfigManager) Set(key string, value any) {
+}
+
+func Set(key string, value any) {
+	defaultConfigManager.Set(key, value)
+}
+
+func (c *ConfigManager) WriteConfig() {
 }
 
 func WriteConfig() {
+	defaultConfigManager.WriteConfig()
 }