Here is a quick guide that i whiped up of a build that i play with gangplank. with this build you will be able to outrun most champions, other than the like of yi and rammus ect. be able to last in a fight and to be able to kite like a pro. almost unstoppable.

i start my build with the meki pendant and a health pot and head to my lane focusing on last hitting and not on harassing so much. the meki pendant is so i don't get stuck on my tower with no manner to push back out again. i sell the meki pendant if i dont have enough gold for future items when im back at base other wise i hold onto it untill i need to fill the slot. ( dont sell befor level 8 )

i rush my boots of swiftness because this is key to harassment in the lane. being able to walk up, parlay and then back off before they can react. also provides well for escaping enemies and when attacking them with physical attacks. no one escapes!

executioners calling is the most important item in the build. it gives a huge amount of critical strike and decent life steal for GP to sustain his health in fights and lane without having to return to base for health, or using his heal skill which is much needed for its cc incase of a gank.

after exe-calling i like to build an avarice blade just for the extra crit chance and it will pay itself off and and most of your other items.

phantom dancer: this is where you have alot of fun, movement speed galore. watch as the enemy team chase you around the map as you kite them with your parlay for chunks. and using your heal if you become slowed or stunned.

infinity edge: crits hurt hard.. nuff siad.

atmas impaler: gives you great survivability with the armor and pushes you up to 100% crit chance.

warmogs: only buy warmogs when you have enough money to buy it outright with a potion of agility ( after selling your avarice blade )

buy all the pots just because you can :D

this is a cheap build and you will be fully built befor any one else. have fun.