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It will be helpful for you to see the example in the CSI help for the application of influence lines and traffic loading as it is a bit difficult to explain the procedure of loading pattern. Normally you have the UDL load for the bridge lane then your point axle loads followed by UDL at the end again. In most cases the speed limit is 10KM to 15kM just to see the maximum BMD and SFD. For the number of vehicle crossing the bridge, you normally design for one vehicle with maximum load case going across the bridge. if you add more vehicles you worst case still will be with the first load case single vehicle. See AASHTO or any other design code you are using you will see the application of maximum load case for single span. Just apply these loads no need to add so many vehicles on the bridge.