How much hops you boil and for how long depends on a few things:
- the gravity of your wort
- the alpha acid % of your hops
- how much bitterness you want to 'extract'
- whether you want bitterness, flavour and/or aroma from your hops
- other things that I've probably forgotten to mention
Heres a link to some kit recipes, some of which include small hop boils that might help you get started
http://www.grainandgrape.com.au/gg_kit_recipes.htmHere's a link to a hop calculator, if you have a play on it, it'll help you get an idea of how things work, and you can use it to help plan brews
http://www.grainandgrape.com.au/Calculators/hop_calc.htm