Hello
First have a look at klimamaps of the world, then you can figure out when is the best time to travel by motorbike in each country.
Depending on your "travelspeed" (different by every traveller) you can plan a basic route around the world.
Plan enough time for shipping between continents depending on your budget.
https://www.horizonsunlimited.com/get-ready/shipping
Next is to check if you can travel that route or if some countries are a problem for you (passport,visa) or your bike (CDP,no Independent motorvehicules possible, only guided.like Thailand, China, Myanmar, check here on the hubb for the latest info).
Once you have that there is the problem when you need a visa, can you get it on the road or only in your homecountry. Many of those visa are only valid a short time before entry.
For your current plan to ship to europe in August, I would say start in nothern europe, then travel south and head into Marokko and spend the "winter" in africa (but I don't know where and when to go there from marokko).
Alternativ, start in August at home and head into mexico and central america, then spend the "winter" in south america.
For visa, south america is pretty easy, central asia is a nightmare, southeast asia and australia/NZ O.K. ,don't know about africa.
have fun planning
sushi