Did your sensei give you permission to buy bogu as well as hakama and keikogi yet? One thing about kendo is that it's always best to ask your Sensei about it first before shelling out any money.
I practice at Mytchett so will see you on the 9th. O'Sullivan sensei will take you though all the basics such as posture and footwork first so it will be a while until you hit (or be hit) in bogu. Just attend with an open mind and try to remember what sensei instructs. Be warned though, Kendo looks funky and aggressive on Youtube but some beginners find the basic drills 'too hard' and repetitive (even boring) so sack it off. Just stick with it and you'll be rewarded in time!