As stated, the clue is in the title - everything you wanted to know about the RNR with regards benefits to the individual, the employer, commitment required, mobilisation, selection, pay, pension, leave entitlement, personal experiences, the good bits, the bad bits, mince pies etc.
OK, lied about the mince pies, but who knows? Your unit may even have a sense of humour.
Casual dress is entirely appropriate at this juncture.
Chances are you'll get a tour of the unit and will watch a powerpoint presentation and a video showing you how cool the RNR is.
There will be a few basic stands set up, possibly an inflated life raft that you can climb in, some tatty firefighting gear to have a skeg at, a trestle table with a cam net on it, some body armour and an SA80.
Having served in an joint environment with a Cavalry Regiment (oh WTF, it was the RTR 'Chav Cav'). Wednesday = Regimental Sport, followed by the Regimental Coffee morning, followed by Lunch. Which meant that getting anything out of any of their Officers, you were wasting your time before about 1400. We used to reckon they actually worked about 17 hours a week.
Has anybody seen the email that did the rounds a few years back from a disgruntled Major that complained that his MBE was not annotated as a Post Nom on Daily Orders? It went round and round the Navy for Weeks. By the time it got to me it must have been forwarded 100 times already.