如何在redhat linux中创建新的数据库实例

I installed oracle 11g rpm package from oracle-xe-11.2.0-1.0.x86_64.rpm.zip in redhat linux.By default i get database XE .My question is how can i create new database like XE i mean new instance.Please can any one suggest me how to do and please suggest me any blogs for this.I installed oracle 11g rpm package from oracle-