man, nobody will say you how to make a bike...you just need to learn how to work with the modeling application and then create it...if you don't know how blender works, you don't have skills to make a bike model...get on youtube and check some basic modeling tutorials, then try to replicate them and start with creating some easy stuff like cans, houses, ect...when you are comfortable with the application and have some modeling skills, get some pictures of the bike and start modeling it
it's useless to come hear and say...hey I don't know nothing about modeling...tell me how to model a bike
hope you get my point, I don't want to sound bad, but that's how it is...