yeah, but when you have no shoes yet, and you have certain pedals on your (second hand) bike, you can just buy the shoes that fit to the pedals.. it's not like one type of pedal/shoe is far better than the other, esp not at the price range you should be looking at, unless you had plans to buy shoes that are half the price of your bike.

second-hand and frame-size is often confusing. two things you can do to get a pretty accurate indication:
1) do this:
http://www.wielersportinfo.nl/fietsafstelling.htm it's usually very accurate.
2) go to a cycling shop, say you might be interested in buying a bike. if u did 1) tell them what framesize you think you are, they might correct you immediately, or get you to a few bikes of that size. just ask if you can sit on it to get a feel, and ask simple things like 'how is my position on this one', 'is it okay or too big/small', if that's the case you could probably try out another bigger/smaller frame. afterwards just say you need to think about it (which is normal because it's a fairly big purchase and you've never owned a racing bike before). then go home knowing what framesize is good for you, and you know what to look for with second hand bikes.

what you'll still be missing out on is getting your bike properly prepared for you. however most of the time (especially if it's your first bike) it's just bullshit. if the guy at the bikeshop doesn't know you, he can never put the saddle / steer at the good height/position for you, because a) he doesn't really know, b) doesn't really care THAT much about u (esp not if u r a new costumer who clearly knows squadouche about bikes). they just have an average standard for this that they use. where i bought my bike he put the saddle AWFULLY low (i mean i raised it at least 5cm since). I used it on the height he set it on for a year (without getting any physical problems), till too many people kept saying 'shouldn't you raise it', now I've been raising it with 1cm for months, and I still feel I could put it a little higher to get a more comfortable/deeper sit..
So yeah...
Only thing is with a second hand bike, it can be a little more annoying when something breaks down, because you'll feel a little bit uncomfortable finding a bikeshop, most of these guys are grade A assholes when you want them to fix a bike for you that you didn't buy in their store..

Will I ever be able to type short messages when it comes to bicycles? I think not.
