Chainset and BB Advice Needed

Hi, i am building my son his first road bike and the frame is a 2007 Giant scr 3.0.
I am confident about putting everything together except the BB and Chainset.
I am thinking of this chainset http://www.ebay.co.uk/itm/130533486625?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649
The listing states that they can supply a BB but what do i ask for? Are there different sizes?
Also what tools would i need to complete the fitting?
Many thanks in advance.
I am confident about putting everything together except the BB and Chainset.
I am thinking of this chainset http://www.ebay.co.uk/itm/130533486625?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649
The listing states that they can supply a BB but what do i ask for? Are there different sizes?
Also what tools would i need to complete the fitting?
Many thanks in advance.
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Help I'm Being Oppressed
If you google it then you get this:
http://www.letsgowithlasco.com/product.php
I don't think your particular chainset is listed but all the square taper chainsets are on a 110 or 111mm axle, so go with 110 and you'll be fine.
Thorn also do short crank arms. Pricier but well made see http://www.sjscycles.co.uk/thorn-110-74 ... -prod1673/ You can run these on a 110 or even 107mm axle to form a double.
As for BBs:
Shimano do them - bit heavy but solid.
http://www.ebay.co.uk/itm/Shimano-Squar ... 7b68568fa9
Otherwise you are into the lighter stuff, such as Hope, Raceface, FSA and at the top end Royce/Phil Wood.
See what Ebay has - you can pick up some good bargains on square tapers as many people make the change to HT2.