Well if you buy the pack which gives you a pass for the themed nightclub gigs and stuff you'll get a few bits and bobs for your fancy dress costumes, a map, etc etc. Then there's a fresher's fair which hands out bags of freebies, with deodorants, shampoo samples, energy drinks, snacks, etc etc. Pro tip, if you take a rucksack you can put the freebie bag in it, then go get another bag, and another bag, and another
Then you can have deodorant wars!!
You won't be able to sign up for the fresher's pack until the conditional offers have been confirmed, I'd guess, because then they'll have finished with all the behind-the-scenes prep with ordering merchandise, booking the music acts and so on. So whilst you might be ready, the uni is still scrambling like mad to get everything done, so you'll have to wait for them
When it's available it'll be on the bathstudent website, there'll be a million and one links to those things all over the site