Auto update a field upon new record creation

Auto update a field upon new record creation

Hello!

Another newbie question...I need to do the following upon the save a newly created Account record:

1. Read a value from a field in a custom module in Zoho CRM
2. Do a calculation based on the value read.
3. Update a field in the newly created record upon saving the record.
4. Update a value in a field in a custom module in Zoho CRM.

Can I do this with a function?  If so, can you give me a hint or point me to an example/documentation?

Thanks!