Lots of noob questions about post-workout shake.

[PumpAddict]

I've finally decided it's time to start taking a few supplements. Right now I'm on a collegiate heavyweight rowing team and not lifting that much but need something to get my energy back up after workouts.
I've done a little reading and it seems for carbs I should be taking a 50/50 mixture by weight of dextrose/maltodextrin for maximum absorption and glyocgen recovery and a little bit of salt to replace lost sodium and improve absorption rate of carbs.
I plan to take some protein (and maybe creatine on days I lift) but I want to just start off with this for now.
Are these good quantities to take?

1L water
40-50g dextrose (30g on lifting days)
40-50g maltodextrin (30g on lifting days)
500mg sodium

Ok now for the noob questions... I just got my huge tubs of carbs and will pick up some salt later. How do I actually measure the stuff out? Should I get some measuring spoons or weigh it out? I have practice pretty early, so can I mix this stuff up overnight and then just let it sit in the fridge? or will it break down? Is plain carbs/salt going to taste really bad without some kind of protein powder in there? Should I be drinking some of this before/during my practice or just save it all for the end? Anything I'm doing wrong?

[IH8CARDIO]

This is for after you lift weights, not after rowing practice, right?

You need some protein in there. I like a lot more carbs than protein but some will do even a 1:1 ratio. I like about 3:1 (3 carbs / 1 protein).

I use a food scale myself. Just makes things easier and more precise. You can pick one up cheap at the bodybuilding.com store.

[PumpAddict]

well yeah like I said I will add some protein in espicially when I lift, but all the carbs are mostly for after practice.
after erging for an hour I really need something to help me recover so I can row hard the next day. so far I've been too exhausted to row hard by the end of the week.

[PumpAddict]

I think I'll get this scale: http://cgi.ebay.com/ws/eBayISAPI.dll...category=34088
the one one BB only measures to 10grams while this one can do .1

So my only other question is can I mix this stuff up the night before or does it have to be done right before I drink it?