Generate CREATE INDEX statements in SQL Server

Use Generate Scripts from SQL Management Studio and choose the "Script Indexes" options (under Advanced Scripting options)

I wrote something for that a while ago. You might have to modify it for your needs, but at least you have a skeleton.

if exists (select 1 from information_schema.routines where routine_name = 'Script_CreateIndex')
    drop proc Script_CreateIndex
go

create proc Script_CreateIndex (
    @TableName varchar(124)
)
as
begin
    if not exists (select 1 from sys.indexes where object_name(object_id) = @TableName and type_desc in ('CLUSTERED', 'NONCLUSTERED'))
        return

    declare @IndexList table (
        Id int identity,
        IndexName varchar(124),
        IndexDescription varchar(max),
        IndexKeys varchar(max)
    )

    insert @IndexList(IndexName, IndexDescription, IndexKeys)
        exec sp_helpindex @TableName

    if (select count(*) from @IndexList) > 0
    begin
        select '-- Creating indexes for table ' + @TableName

        while exists (select 1 from @IndexList) 
        begin
            declare @Id int, @IndexName varchar(124), @IndexDescription varchar(max), @IndexKeys varchar(max)
            select top 1 @Id = Id, @IndexName = IndexName, @IndexDescription = IndexDescription, @IndexKeys = IndexKeys from @IndexList order by Id
            delete from @IndexList where Id = @Id

            declare @Clustered varchar(10), @Unique varchar(7)

            select @Clustered = case when patindex('%nonclustered%', @IndexDescription) > 0 then '' else ' clustered ' end
            select @Unique = case when patindex('%unique%', @IndexDescription) > 0 then ' unique ' else '' end

            select 'if not exists (select 1 from sys.indexes where name = ''' + @IndexName + ''')'
            select 'begin'
            select char(9) + 'create' + @Unique + @Clustered + ' index [' + @IndexName + '] on [' + @TableName + '](' + @IndexKeys + ')'
            select char(9) + 'select ''Index ' + @IndexName + ' created.'''
            select 'end'
            select 'go'
        end

        select ''
        select ''
    end
end
go

grant exec on Script_CreateIndex to public
select 'Script_CreateIndex compiled.' 'Job'
go

Check my solution here: https://stackoverflow.com/a/55742250/1831734

Output

Create                                                                                                      Drop                                    Rebuild
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
CREATE CLUSTERED INDEX [PK_Table1] ON [Table1] ( [Tab1_ID] )                                                DROP INDEX [PK_Table1] ON [Table1]      ALTER INDEX [PK_Table1] ON [Table1] REBUILD 
CREATE UNIQUE INDEX [IX_Table1_Name] ON [Table1] ( [Tab1_Name] )                                            DROP INDEX [IX_Table1_Name] ON [Table1] ALTER INDEX [IX_Table1_Name] ON [Table1] REBUILD 
CREATE NONCLUSTERED INDEX [IX_Table2] ON [Table2] ( [Tab2_Name], [Tab2_City] )  INCLUDE ( [Tab2_PhoneNo] )  DROP INDEX [IX_Table2] ON [Table2]      ALTER INDEX [IX_Table2] ON [Table2] REBUILD