How to implement this ina partition table

Hi Friends,
I've some issue. Let me explain it -
I've one table named -
CREATE TABLE syst_part
tx_id NUMBER(5),
begdate DATE --begdate will be always system date
);1) Every day i need to keep only 3 days data. So, at the start of the program i need to delete all the data which is more than 3 days old. The volume of this deleted record will be at least 1 million.
2) Now i've to insert data which is coming through various process. And, it's volume will be also 1 million.
So, i want to implement this in a partitioned approach by taking only 4 partition say part1, part2, part3 and part4 based on the begdate.
And, i would like to reuse these partition to run my process for next 5 years(Forget about this time frame).
I need to truncate only the partition which holds (sysdate - 3) data.
The advantage will be - in this method i guess it would be faster to remove those old data from the table.
Can this be achieved by using partition?
I'm not sure about the method of reusing this partition alternatively as they appears free.
Thanks in advance for your reply.
Regards.
Satyaki De.

Thanks Rossi for your reply.
The main reason of using the limited partition alternatively is - i can easily find the empty partition.
SQL>
SQL> ed
Wrote file afiedt.buf
1 SELECT i.table_name, s.index_name, s.tablespace_name, s.partition_name, s.status, s.num_rows
2 FROM user_ind_partitions s, user_indexes i
3* WHERE s.index_name = i.index_name
SQL> /
TABLE_NAME                     INDEX_NAME                     TABLESPACE_NAME                PARTITION_NAME                 STATUS     NUM_ROWS
M                              MX                             ERSDATA                        P1                             USABLE            0
M                              MX                             ERSDATA                        P2                             USABLE            0
M                              MX                             ESSDATA                        SYS_P82                        USABLE            0
SQL> spool offFrom num_rows column i can get the empty one.
Regards.
Satyaki De.

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