It is recommended that you conduct regular rounds of face to face meetings and to maintain frequent telephone and email contact in between visits.
Dress conservatively for official meetings. Use surnames until you are invited to use first names.
Ask if a meeting can be conducted in English and provide an interpreter if necessary, even though English is usually spoken in larger and international companies.
Be sensitive to the fact that the older generation tends to be quite conservative.
More information on doing business in the Czech Republic