You must somehow construct virus-like particles. This is awfully complicated.
You can take a look at how the Virus
Like Particle technique works.
Before your vaccine is seen as fit for production and distribution, it has to undergo these 5 stages
PRECLINICAL TRIAL
In this early stage, your vaccine are to be tested on animals, like lab rats. Then evaluate wheter or not they successfully induce immunity.
PHASE I CLINICAL TRIAL
Here you o a limited test of your vaccines to a group of randomly selected individuals. The goal is to see if your vaccines have some potentially dangerous side effects. Please remember to do the test only on healthy persons.
PHASE II CLINICAL TRIAL
Now the test gets bigger, involving hundreds of people from diffrent demographics, including the elderly, children, and members of vulnerable groups. You still keep a close eye on safety, and try to determine the appropriate dose.
PHASE III CLINICAL TRIAL
It gets even bigger, with thousands people now involved. You give the actual vaccine to some, and dummy ones to some others for a placebo effect. Then you compare the results to see how well the vaccines really go.