Please help me. I'm new to Oracle.

Hello all
I'm Sean and new to Oracle and wana purse learning Oracle Forms&Reports but to start I need to also learn Oracle DataBase as well.
Please I know you're all busy but HELP me to fix this problem and start learning Oracle.
I've installed oracle DB 10G. XE. without any problem and have been using it everyday BUT I just installed Oracle SQL Dev v. 1.2.1.... and can't creat a new connection. (it's all installed in my compaq laptop using Win XP SP 3).
I've been reading all the comments in forums but I'm still stuck. PLEASE SOME ONE HELP ME.
Learning from all you guys comment I looked at my Listener.ora and it looks like this:
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = C:\oraclexe\app\oracle\product\10.2.0\server)
(PROGRAM = extproc)
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = C:\oraclexe\app\oracle\product\10.2.0\server)
(PROGRAM = extproc)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
(ADDRESS = (PROTOCOL = TCP)(HOST = Shawn_COMPAQ)(PORT = 1521))
DEFAULT_SERVICE_LISTENER = (XE)
and my sqlnet.ora looks like this:
# This file is actually generated by netca. But if customers choose to
# install "Software Only", this file wont exist and without the native
# authentication, they will not be able to connect to the database on NT.
SQLNET.AUTHENTICATION_SERVICES = (NTS)
The tnsnames.ora looks like this:
XE =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = SHAWN_COMPAQ)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = XE)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
ORACLR_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
(CONNECT_DATA =
(SID = CLRExtProc)
(PRESENTATION = RO)
from looks of it comparing to what I have seen in ppl's comments and copy&past of files in forums, my 3 files all looks weird and I guess it missing lot of things.
when I try to create a new connection to see built-in schema (HR) all though it's unlocked but sql dev can't establishes a connection.
In New \ Select database connection window for following fields iI put:
Hostname = localhost:1521:orcl (I 've tried just putting localhost)
Port = 1521
SID = orcl
In my browser when I am in home page of DB 10g XE the URL reads: http://127.0.0.1:8080/apex/f?p=4500:1000:4313426409493576
When i put hostname = localhost (or either 127.0.0.1) and port = 1521 and SID = orcl, I'm getting error :
status: failure-listener refused the connection with following error - ORA-12505, TNS: listener doesn't currently know of SID given in connect descriptor The connection descriptor used by client was: localhost:1521:orcl .
When I just change the Port to 8080 I get the error:
Status: failure-Io Exception: Got minus one from a read call.
By default DB 10g XE installed in: C:\oraclexe\app\oracle\product\10.2.0\.............
and all the mentioned files (3 files mentioned above) are in: C:\oraclexe\app\oracle\product\10.2.0\server\NETWORK\ADMIN
Please I know you're all busy but HELP me to fix this problem.
God bless you.
tnx
Sean

Thanks a lot.
Yes. It works well now.
In it's documentation it says put orcl for SID but never thought to try default xe.
You're the man.
tnx

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