I’m a newbie too but I got everything I thought I would need and at the best price, so I went for it.
The Canon 40D is tip-top. The body and lens come separate so make sure you do not get any dust, dog/cat hair inside the body or the lens itself. Just take your time. Read the manuals for a bit, relax and then put it together. There’s no need to rush and make an expensive mistake. It’s easy to do but it’s also easy to contaminate.
Yes I would get the Canon BG-E2N (Battery Grip).
It’s not absolutely necessary, but obviously you can shoot for longer, it has the advantage of making the centre of gravity closer to the camera body if you have a heavy lens but it also has a side grip with some buttons and a dial that changes settings on the 40D directly.
So yes, it is a good investment and the grip can be attached to a triode.
This is also what I would recommend you get.
These prices below cannot be beaten
B+W 77 mm Kaeseman Circular Polarizer Multi-Resistant Coating (MRC) Glass Filter
B+W 77mm UV Haze 010 (MRC) Multi-Resistant Coating Glass Filter
Canon BP-511A Lithium-Ion Battery (3 off)
Pec-Pad Photo Wipes
Hama Lens Cleaning Pen
Q Ball blower
Let me know if you want any of the above and I will point you in the right direction.