I am looking to deploy Odoo 12 Community Edition for a small sized company (around 10 users) on a local server, maybe with 3-4 free or paid extra modules and some small module developed by myself. I will be charging said company for my work of implementing and configuring the system. Said company will be using the system to manage business.

Are there parts of the license forbidding me from doing any of the actions above?
If it is all allowed, is there anything required of me I should be aware of (like explicitly providing the Odoo source code to the client, documenting all changes and configuration, etc.)?
Also, are there any major pitfalls or limitations (like a limited number of users, limited number of modules, limited number of automatic module installation, not being able to finish deployment without some official Odoo intervention, etc.)?

Please excuse me if this question is a duplicate: I tried searching the forums but found no clear answer. I also searched other resources (the license agreement, questions on other sites, etc.), but I am not very experienced in legal matters and I ultimately could not answer these questions. Some examples from the questions above (limited number of users, limited number of automatic module installation, not being able to finish deployment without some official Odoo intervention, etc.) are what I found in searching the web, but I am not sure if they are correct.