1. Limit characters in product name
There are many ways you could do this, one would be to simply limit the number of characters that the database field for product name can accept. To provide feedback about this to the provider, you could use javascript validation on the product form.
2. To provide your line break is a little more tricky, you will need to write some logic that counts the characters in the product name variable and seperates it into two new variable which you could then display.
http://www.smarty.net/docsv2/en/language.modifier.count.characters.tpl
If you need more info on either of these solutions just ask.