This should make a good first project. From group projects that I've worked on before, a good strategy is to decide on the classes that the program will be made of, and how they will interface with one another. This means that people can be responsible for individual classes, which gives everyone a direction and also reduces the risk of people breaking each others' code. It is also important to keep classes compartmentalised - for example, the properties 'position' and 'is_alive' of a given ghost would be stored within an instance of the 'Ghost' class, and only the Ghost itself would ever change those values (although it might present an interface with which it could be controlled - for example 'move(direction) or die()').
If we take this approach, it will be important that everyone has a basic understanding of 'object-orientated' (class-based) programming; essentially this is a way of organising code so that rather than writing programs purely in terms of 'steps', you instead write then in terms of 'things' which can interact with one another (like 'Ghost' or 'World', or more abstract concepts such as 'RoutePlotter', 'GUIManager'). These classes can also extend ('inherit') others, so it might be a good idea to define an 'Entity' class (with properties like 'position' and 'speed'), and then to define 'Ghost' and 'Pacman' which inherit from Entity (and as such, automatically acquire the 'position' and 'speed' properties without having to do anything else!). Any decent Python tutorial will at some point explain all these concepts and how to implement them (I'm also more than happy to answer questions or give demos at the club). If you understand the aforementioned terms 'class', 'instance', 'interface', 'inherit' and 'property' (and how to implement them in Python) then you're well on track!
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