check this link out, it will help a little.
The extras you need will depend on how much you are going to do yourself. Are you wanting to cut wheels, make your own screws etc.
Here is a link to a book about the Taig lathe.
If it works out cheaper to buy a “starter pack” then this could be the way to go, give us a link so we can see what is in it and then we can tell you how useful the extras are.
If it is not any cheaper it might be best to just get the lathe and then buy the extras as you need them.
A dial indicator is a useful tool to buy with the lathe as this lets you know if the work is true, very handy when trying to set work up in a 4 jaw chuck.