1) Bedding(not beading) improves the wood to metal fit and keeps the action from moving in the stock. The 'glass' part is fibreglas fibres mixed into epoxy to add strength. It doesn't guarantee better accuracy, but it will be more consistent. Nor does 'free floating' the barrel. That's having the barrel and stock never touching. Some rifles like it, some don't. The only way to find out if your rifle will shoot better 'floated' is to try it. If it does, fine, if not putting a pressure point back in is no big deal. Have a look at the Acraglas kits.
2) Depends on the make of the rifle. Most are about 4 to 5 pounds, but not smooth. Some, like the Remington Model 700 and some Savage rifles have adjustable triggers. Smooth and crisp is more important than light. Think in terms of trying to lift 5 pounds with one finger. 3 pounds is much easier.
A trigger job involves polishing all the mating parts of the hammer and sear to smooth off any tool marks. Just changing the springs will lessen the trigger pull though. If you don't know how to do it, leave the trigger alone. It's easy to bugger it up completely.
