What is the main points or steps that should be in any organization want to implement ERP ?

1. Planning Phase

2. Analysis Phase

3. Integration Phase

4. Action Phase

Management decision and Define business requirements

Internal Business analysis making sure about understanding all details

Prepare an RFP and send it to ERP vendors (optional)

Conduct ERP vendors meeting and prepare for demonstration per each vendor

Eliminate ERPs that don't meet  up to70% of your requirements and prepare a vendor short list.

Ask for a Proof of concept (POC) for the short listed vendors to present which will help to determine the skills of the vendor and a better knowledge about the ERP and how it meets your requirements

Ask for customization % (Estimation)

Select the best ERP for your organization

Review and analyze company's hardware and network and that they meet the ERP requirements

User orientation

Form an ERP team.

Implementation Phase starts.

Broadly following would be main point;

1. Business Need

2. Evaluation of product vendor

3. Analyzing the current business processes.

4. Development Phase

5. Testing / UAT phase

6. Roll out phase

1.  Selection of appropriate ERP Solutions.

2.  Predetermine Objectives.

3. Process Flows Review

4. Orientation & Training

While you should concentrate on the above points mentioned, I would emphasize on having a time period and well defined project plan. Also, it is a must to develop skilled administrators/staff in house which will help any company to save valuable time and money in the long run.

Please have a look at the followig PPT presentations:

http://www.slideshare.net/elsherifr/sap-erp-implementations

http://www.slideshare.net/elsherifr/intorudction-to-erp

In a nut shell

1.Before implementing  ERP one has to  create readiness and awareness  in the organization example: why is ERP useful and so on and so forth..

As it is a System Change so "change management"plays important role as the users  are reluctant to  change.

2. Then comes mapping of legacy system with the new system