I did first-year archaeology this year. Basically junior archaeology is split into two parts - a generic introduction to the processes and techniques of archaeology and the key issues of the discipline (which this year was ARPH1001) and more specialised units about the archaeology of particular areas (ARNE1001 - near east - and ARCL1001 - classical world). However, they've now changed the first year, and the specialised courses have been combined into one generic course called 'Ancient Civilisations', which covers Mesoamerican and - I think - Southeast Asian cultures as well. Next year is the first time that course will run, so I can't tell anything about it. Presumably it'll focus on the broad history of the development of those cultures, their art, architecture, pottery, subsistence methods and so on.
As to Introduction to Archaeology: it's reasonably interesting, but fairly basic. Covers in a brief fashion stuff like excavation theory (law of superposition, strata, etc.), site survey, artefact classification and so on before moving on to themes in archaeology, stuff like the development of agriculture and writing, archaeology of gender, archaeology of religion, environmental archaeology, ethnoarchaeology. Some of it is pretty interesting. Pretty easy as well, I got an HD without enormous effort. The tutes are actually workshop sessions where you do stratigraphy, artefact classification, sorting through rubbish and that sort of thing in the archaeology labs. Some of them are pretty fun.
Now that they've got rid of ARCL1001, I'm not sure to what extent junior archaeology would complement ancient history, except on a very broad scale. The units which focus on the classical world (ARCA2613 Athenian Art Architecture and Society, and ARCA2615 Etruscans and Romans) aren't available until senior level. It's a reasonably interesting topic though, and I'd recommend having a go at it if you have units free. (I'd advise you to avoid ARNE1001 like the plague, but they've cancelled it, thank god.)