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As now onwards you will be able to create screens views so an important reading at this place will be Best Practices Guide .   On this page there links to following:

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Note : Important point to note here is that the person 'Mr. THE PRIVILEGED ADMINISTRATOR' has a partyid admin has multiple logins as listed in the
User Name(s) form.
Step : 4 - We interested in the admin user login so click on the 'Security Groups' button and confirm that the use 'admin' is part of the 'FULLADMIN' group. The Groups that the user belongs to is shown in the bottom list form Drill down on the FULLADMIN.
Step : 5 - Click on the Permissions tab. This tab shows all the permissions for the FULLADMIN security group. Navigate between the permissions till you find the OFBTOOLS permissions.
'OFBTOOLS_VIEW Permission to access the Stock OFBiz Manager Applications.' This confirms that the userlogin 'admin' has the permission 'OFBTOOLS'
Step : 6 - Take a moment  to review the entity model as it relates to users and permissions. The arrow represents the many side of the relationship.An really important reading at this moment is at : OFBiz Security

Writing CRUD operations:

Create, Update and Delete operations for an entity will be done by services which we will be writing in minilang.

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Step - 3: Now all the services which you have written needs to be loaded when server starts so you need to do an entry for service definition in ofbiz-component.xml file which will be like :            

<service-resource type="model" loader="main" location="servicedef/services.xml"/>

So whenever you make any change in any service definition then you must restart the server to have changes in effect.

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First we will be writing services for Party then while writing services for creating Person we will be calling the service for party.

*Step - 1 :  Create a file by name "services.xml" in servicedef directory.

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This new feature enables you to just define the services by mentioning the operation you want to perform.Basically just set the engine attribute to "entity-auto" and the   invoke attribute to "create", "update", or "delete".
like you can take a look in the following code from services.xml of example component:  

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Step - 1 : Create the add form for the creation of person and add this in the same screen for person form.

Step - 2 :  Write CRUD operations for person entity.

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The file name will be PracticeEvents.java and will be created at  practice/src/org/hotwax/practice.

Simple Event 

Step - 6 :  Now in the script/org/hotwax/practice/ create one file by name PracticeEvents.xml.

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For the implementation of Group service follow these steps: 

Step - 1 :  Add another menu item to applicatoin menu bar by name "Group Service".(Do the needful entries for target in controller.xml)

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Step - 3 : For loading the defintion you need to do an entry in your ofbiz-component.xml file like:

<entity-resource type="model" reader-name="main" loader="main" location="entitydef/entitymodel.xml"/>

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This is the simplest form it can be more complex. This will add up one more field to the entity you already have. Now it depends which field you want for your custom needs. Here you can also defined relation of this field with other entities you want. But before doing this you should search extesively may be you will be adding a field for a purpose and there is already a field which will serve the purpose, so be concisous about this. Also go for a extensive study of data model then do this.
 

For entity engine configuration dont forget to read : Entity Engine Configuration Guide

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