Hi there! Congratulations on your unconditional! I'm in the exact same boat as you, accepted my unconditional for Computer Arts about two weeks ago!
After reading the whole way through the Abertay website (so excited to start studying here!), I found out on the website's open days page that invites for Applicant Days are sent out from February onwards, and run from March through to April. We'll probably receive an email from them sometime soon.
As for accommodation, the only information Abertay has stated so far is that applications for 2016/17 are opening in the spring, and to keep an eye out on their accommodation page on their website.
In terms of the UP programme, unfortunately there is no way to apply just yet, though I can probably guess that applications will be open some time in spring too.
Hope this information helps! And once again, Congratulations on your unconditional!