How to start to create a sales model/forecast?

Unless you have a comprehensive CRM solution, I recommend to start by compiling all opportunities in a spreadsheet. List out

 - Country/Market

- Compelling event/motivation of the client

- Category of product/service to be delivered

- Total contract value TCV

- Probability /sales stage 

- Weighted TCV (i.e probability multiplied with TCV)

- Expected closing date

- Actions required to close

By summarizing the TCV column and weighted TCV column you can quickly get an estimated of both weighted and unweighted pipeline.

Hope this helps.

Thanks for invitation -

Action detailed study - Product - site sales - competitive prices - and competitive offers - Incentive markets - the final report - the work of the feasibility study !!!

Thanks

I totally agree with the answer given by Mr. Andreas .................

Regards

agree with great answer given by Mr. Andreas Gaarder 

by practical analysis to parametric change for sales issue  in the market  

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This question needs a real expert answer so I would just agree with Mr. Gaarder.

Though I appreciate your invitation.

by following the below steps: 

• develop a unit sales projection. 
• Use past data if you have it. 
• Use factors for a new product. 
• Break the purchase down into factors. 
• Be sure to project prices.

Thanks for invocation..

I agree with all answers.