The assignment of ISSN number could be the easiest step, where you can apply through the following link:
https://www.issn.org/services/requesting-an-issn/
You need to fulfill the requirements of issuing ISSN number. Be noted that ISSN assignment is a chargeable service. Service packages are also available on request. All the details are in the following gridline:
Regarding the submission and peer-review system, the ScholarOne™ Manuscripts platform is the most effective tool to host your journal’s submission and peer review through a streamlined process.