If there is no response from KhornateMonkey (former owner of GruppeSechs company) then you are allowed to use and register this business. If KhornateMonkey does respond and does not want you to use it, then you are allowed to continue under another name.
I don't think script support is necessary, because all the things necessary to create this company do not need script support. You only need people that are willing to roleplay with you. I suggest you to take a look at the business topic KhornateMonkey made for this company. It shows that it can be a good and fun business to have if executed correctly.
If you have gotten permission from KhornateMonkey, I would like you to prove yourself and your company first before you can ask "additional support". KhornateMonkey made this business possible without any "additional support". There are state stockades (and you can buy one, if not you can buy from a manager), there are skins for security gaurds you can buy. You first need to prove yourself and your company that you can run it and that you can run it good. Make roleplay your first priority, hire people, have a good influence on the players around you. If you can achieve this status we can talk about "additional support".