Becoming a NAV reseller in Italy.

Hi to everyone. I am not sure if this is he right place to place this post. I am trying to become a NAV reseller . We are a 10-employecompany. Witha vertical ERP developed on our own during 10 years on AS/400 or whatever they all it now.

After a negative experience with SAP Business One where it's extremely difficult developing add on.. I'd like to know about other people's experience. Hint's about  people to contact, what  kind of requirements are needed and so forth. I am Italian but I speak english at an intermediate level. Any help I can get would be greatly appreciated.