Great work indeed!!!! Well done! Fabulous to see Dux becoming so popular!
@ Christian: You need 3 heroes and a champion, 6 elite armoured bodyguards, 12 'proper' warriors and 18 levy spearmen plus 4 missile troops (e.g. archers) to do the basic Romano-Brit force.
Then you need to get a few spares in case you are lucky enough to win big!! No unit will ever go above 8! You may also be able to 'upgrade' units as time goes on, so you may need an extra 6 elites, plus more 'proper' warriors. You should also consider at least 4 armoured cavalry and some (4) skirmishers (javelin or sling-armed, I suggest, to differentiate from the missile troops) You also need a mounted hero with the cavalry. Personally, I'd buy at least 8 cavalry models to account for gaining 2 lots of them as reinforcements...
Saxons start with the same number of heroes, then they need 12 elite guards, 18 warriors and 4 missile troops. They have no levy. Spares and extras-wise, the Saxons need skirmishers or warriors and may gain 4 light cavalry.
However, unless you are:
a) very lucky
b) very good at generalship
you won't need too many extras or spares for a while. I have played 6 games and only just managed a win big enough to add 2 warriors to one of my units!!!
Hope that helps.
Andy