backup oracle db on windows

I have a backup script that I manually run on a windows 2003 server which I will include below.I manually change the backup directory name everyday before I run the script. But this is a hassle when I have a day of and so.  I wanted to schedule this job in windows so that this script can run automatically. I tried to schedule it already but somehow it can not do the connection part. so I want to know what needs to be added and how it needs to be added to this script so that it can set the environment, start sqlus and login and run the alter tablespace begin backup lines, create a backup controlfile that is able to recover the db with when needed, include the copy of the spfile to the backup directory and also the last archive log that is create with the alter system switch log statement this last archlog file needs to be copied or go the backup directory also. I want the files to be zipped also and I do have the special winzip module for that but don't know how to use it in a script.

I wanted the script to create a new directory every day so that the backup can go to a different directory every day. But I don't know or I don't have the knowledge to be able to script something like that. I think if this line can go at the first line and then if somehow it is projected in the ocopy command so that it uses that new directory everyday and so I don't need to change the script every day.

What also will work I think is that I create 7 directories and 7 scripts and schedule 7 backups in the schedular which will be easier. Then this directories will be overwritten every week. But I still needs the tips of how to script the start of sqlus, the login and the copy or creation of the backup controlfile, the arch log and the parameter file to the backup directory.

I don't want to use RMAN yet because I don't understand it so good and most of our databases are on unix with perfect scripts that does everything we want but this one is on Windows and that is my weakness here.

this is the script:
spool d:\oracle\backup\cusdb\BU168\bkup0406.log
alter tablespace system
begin backup;
host ocopy D:\ORACLE\ORADATA\cusdb\SYSTEM01.DBF d:\oracle\backup\cusdb\BU168
alter tablespace system
end backup;
alter tablespace undotbs
begin backup;
host ocopy D:\ORACLE\ORADATA\cusdb\UNDOTBS01.DBF d:\oracle\backup\cusdb\BU168
alter tablespace undotbs
end backup;
alter tablespace drsys
begin backup;
host ocopy D:\ORACLE\ORADATA\cusdb\DRSYS01.DBF d:\oracle\backup\cusdb\BU168
alter tablespace drsys
end backup;
alter tablespace example
begin backup;
host ocopy D:\ORACLE\ORADATA\cusdb\EXAMPLE01.DBF d:\oracle\backup\cusdb\BU168
alter tablespace example
end backup;
alter tablespace indx
begin backup;
host ocopy D:\ORACLE\ORADATA\cusdb\INDX01.DBF d:\oracle\backup\cusdb\BU168
alter tablespace indx
end backup;
alter tablespace tools
begin backup;
host ocopy D:\ORACLE\ORADATA\cusdb\TOOLS01.DBF d:\oracle\backup\cusdb\BU168
alter tablespace tools
end backup;
alter tablespace users
begin backup;
host ocopy D:\ORACLE\ORADATA\cusdb\USERS01.DBF d:\oracle\backup\cusdb\BU168
alter tablespace users
end backup;
alter tablespace arch1cts
begin backup;
host ocopy D:\ORACLE\ORADATA\cusdb\ARCH1CTS.DBF d:\oracle\backup\cusdb\BU168
alter tablespace arch1cts
end backup;
alter tablespace idx1cts
begin backup;
host ocopy D:\ORACLE\ORADATA\cusdb\IDX01CTS.DBF d:\oracle\backup\cusdb\BU168
alter tablespace idx1cts
end backup;
alter tablespace idxcsa
begin backup;
host ocopy D:\ORACLE\ORADATA\cusdb\IDXCSA.DBF d:\oracle\backup\cusdb\BU168
alter tablespace idxcsa
end backup;
alter tablespace datcsa
begin backup;
host ocopy D:\ORACLE\ORADATA\cusdb\DATCSA.DBF d:\oracle\backup\cusdb\BU168
alter tablespace datcsa
end backup;
alter tablespace dat1cts
begin backup;
host ocopy D:\ORACLE\ORADATA\cusdb\DAT01CTS.DBF d:\oracle\backup\cusdb\BU168
alter tablespace dat1cts
end backup;
alter system switch logfile;
alter database backup controlfile to 'd:\oracle\backup\cusdb\BU168\bkupctrlfile.trc';
spool off
exit