Finalizing an access database for managing customer related information

I am currently setting up a database for customer management via microsoft access and need some help designing the front end. The database is going to be used simultaneuosly by less than 10 people using access runtime. I already created the tables for the database and tried to design a front-end myself which can be used as a draft regarding mechanics and functionality. The design can be freely modified as wished. The database is in german so some german skills might help but i can also translate it into english if necessary. I would need the following forms to be created or modified: 1. Navigation menu 2. Save a new lead (user can add new leads here, the system should automatically detect if the lead id is already been used; the user should also be able to search for existing customers or, if not already existing, should have the possibility to add the customer information; he should also be able to log a call.) 3. Search and modify an existing lead (similar to form 2, with the possibility to search for leads via id or customer e-mail) 4. Log a Call 5. Add a new customer I added some pictures on how the forms are looking right now. As you can see, the design is completely missing. If you are interested, i can provide you further information on which specific mechanichs the forms should have implemented. Best regards