Too long to answer here, there's half a dozen or so of styles. check out www.bicycletutor.com, www.parktool.com or www.sheldonbrown.com for pointers.
A Haro F1 uses a "standard USA" bottom bracket with press-in cups (as opposed to a "Euro" bottom bracket, like what road and MTB bikes use). These bottom brackets don't come in sizes because there's only one size. Bottom bracket spindles do, however, vary based on the crankset you're using. If you're talking about the Haro Fusion cranks that come with that bike, you're talking about a 19MM, 8 spline spindle, which is actually pretty standard.
Yes, if you can find the correct bottom bracket for the frame.
BB usually stands for Bottom Bracket, the part which holds the cranks/pedals to the bike
You need a special tool called a crank puller. Then, depending on your bottom bracket you might need another special splined tool to get the BB spindle and bearings out.
with W D 40 or just regular bike oil.. i usually oil my bottom bracket and headset bearings and the chain
Yes, you just need to remove the center bracket (back seat bracket) on your bike
IF your bike is squeaking when you pedal it is most likely because your bottom bracet is old and dry. i recommend getting a new bottom bracket, or at least the bearings.
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If the bike has a quill stem, then there is a wedge at the bottom of it to lock the stem into the fork. There are also rare seat posts which use a wedge at the bottom as opposed to the regular seat post clamp. Even rarer are brakes who are activated by a wedge being moved to bring the brake arms together. Old cranks may use a special type of wedge called a cotter to lock the crank to the bottom bracket spindle.
Installing a mid bottom bracket is very simple. All you do is tap both bearings into both side of the frame evenly, they do not have threads or anything like that its just simple pressure, don't hit it to hard though because you could crush the bearings.
It's a bike frame that measures 18" from center of bottom bracket to top of seat tube. 18" would be just a tad shy of mid-sized.
The oil drain plug for a GSXR 600 is on the bottom of the motor, usually near the rear of the bike. You will need to remove the fairing to get to it, and it will be the largest "bolt" on the bottom of the bike.