create table in Db2

Dear experts

I am using Db2-ExpressC
In the db2 command editor i am trying to create a table and insert records in that table.
I have done that in oracle but am new to db2. this is my table structure


create table entity_sample(productId varchar(64), name varchar(64),productPx numeric(18), description varchar(64))
(the above create command doesnt seem to work)

this is the error i get:

>>>>>>>>>>>>>>
------------------------------ Commands Entered ------------------------------
create table entity_sample(productId varchar(64), name varchar(64),productPx numeric(18), description varchar(64));
------------------------------------------------------------------------------
create table entity_sample(productId varchar(64), name varchar(64),productPx numeric(18), description varchar(64))
DB21034E  The command was processed as an SQL statement because it was not a
valid Command Line Processor command.  During SQL processing it returned:
SQL1024N  A database connection does not exist.  SQLSTATE=08003
SQL1024N  A database connection does not exist.
Explanation:

There is no connection to a database.  Other SQL statements
cannot be processed unless an SQL CONNECT was previously
executed.  

The command cannot be processed.  

User Response:

If the error occurred when disconnecting from the database,
continue processing.  If the error occurred on another SQL
statement, issue an SQL CONNECT statement and resubmit the
command or statement.  

 sqlcode :  -1024

 sqlstate :  08003
>>>>>>>>>>>>>>
can anyone please tell me whats going wrong.

2.
also , if i wanted to insert data in the above table like
productId :123
Name      : apples
productPx : 15
description : My first product
what would the statement be?

3.
How do i set the "productId" as primary key. Can i do it in the command editor itself?

thanks
J