How to load tables that have indexes on them

Question

Since I am new to setting up a database on sql server 2008 r2 and creating tables that are referenced by foreign keys, I would like to ask the following about the 4 tables that I created below:
   In 3 tables the data will not change much after the data is initially loaded. However in the table called Rej_History, I will be loading data to that table daily. Thus for all the tables, can you tell me if I need to drop indexes every time I update the data. Basically can you tell me and/or point me to a reference that will tell me how to setup a script to load the data?

CREATE TABLE [dbo].[Rej_Contacts](
[MRC_Contact_ID] [int] IDENTITY(1,1) NOT NULL,
[MRC_Prefix] [varchar](30) NULL,
[MRC_Last_Name] [varchar](50) NULL,
[MRC_First_Name] [varchar](50) NULL,
[MRC_Phone_Number] [varchar](25) NULL,
[MRC_Email] [varchar](150) NULL,
[MRC_Address] [varchar](100) NULL,
[MRC_City] [varchar](50) NULL,
[MRC_State] [varchar](2) NULL,
[MRC_Zip] [varchar](10) NULL,
[MRC_Update_Date] [datetime] NULL,
[MRC_Updated_By] [varchar](50) NULL
CONSTRAINT [PK_Rej_Contacts] PRIMARY KEY CLUSTERED
(
[MRC_Contact_ID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
------------
CREATE TABLE [dbo].[Rej_History](
[MRH_Id] [int] IDENTITY(1,1) NOT NULL,
[MRH_Plan_Id] [int] NULL,
[MRH_Create_Date] [datetime] NULL,
[MRH_Code_ID] [int] NULL,
[MRH_Tran_Count] [numeric](18, 0) NULL,
[MRH_Batch_Size] [numeric](18, 0) NULL,
[MRH_Tran_Code_Description] [varchar](max) NULL
CONSTRAINT [PK_Rej_History] PRIMARY KEY CLUSTERED
(
[MRH_Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[Rej_History] WITH NOCHECK ADD CONSTRAINT [PK_MRH_RNumber] FOREIGN KEY([MRH_Plan_Id])
REFERENCES [dbo].[Rej_Plans] ([MRP_Plan_Id])
GO
ALTER TABLE [dbo].[Rej_History] WITH NOCHECK ADD CONSTRAINT [PK_MRH_Tran_Codes] FOREIGN KEY([MRH_Code_ID])
REFERENCES [dbo].[Tran_Codes] ([TRC_Code_Id])
GO
----------------
CREATE TABLE [dbo].[Rej_Plans](
[MRP_Plan_Id] [int] IDENTITY(1,1) NOT NULL,
[MRP_PLan_Number] [varchar](10) NULL,
[MRP_Contact_Id] [int] NOT NULL,
[MRP_Parent_Organization_Name] [varchar](100) NOT NULL,
[MRP_Update_Date] [datetime] NULL,
[MRP_Updated_By] [varchar](50) NULL
CONSTRAINT [PK_MRP_RNumber] PRIMARY KEY CLUSTERED
(
[MRP_Plan_Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
----------------
CREATE TABLE [dbo].[Tran_Codes](
[TRC_Code_Id] [int] IDENTITY(1,1) NOT NULL,
[TRC_Tran_Code] [numeric](6, 0) NOT NULL,
[TRC_Type] [char](1) NULL,
[TRC_Title] [nvarchar](75) NULL,
[TRC_Long_Definition] [varchar](max) NULL
CONSTRAINT [PK_Tran_Codes] PRIMARY KEY CLUSTERED
(
[TRC_Code_Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]