post-install config????????

[zb cong]

hello
i install the oracle10g on redhat9 box,JUST finish the installation,i open the Terminal windows,type �sqlplus� command,linux tell me �commnd not found�. i guest the installer don�t set the env variable(in windows operating system,the installer automatically set the path variable during the install procedure).i can SUCCESSFULLY access the browser console of em and isqlplus.

but after i restart the redhat,the browser can�t access both of em and isqlplus(connection reset).when i telnet the 5500 and 5560 port,i found that they haven�t be open.and i suspect that the oracle database haven�t been automatically started.
question 1:how can i MANUALLY start oracle after i restart the linux?
question 2:how can i config the oracle after the install to make it work perminently?or post-install configuration.