going from 15" to 18"; anything i should know????

this is my fist car to have fixied up nicely. i have never replaced the wheels on a car before and want to make sure i dont spend a big chunk of change with out knowing what i am doing first. i have a 1998 honda accord ex 4 cylinder sedan.

this is the link to the wheels:
http://www.seffects.com/catalog/prod...e=FOC173-8703S

and this is the link to someone else's car located on cardomain.com; this is the car i saw that made me choose these rims:
http://www.cardomain.com/id/cdiddy42

any input anybody thinks is important that i should know, please leave. like i've seen larger brakese advertised for larger wheels, and then theres that whole offset thing. and even though i have read about, i'm still half clueless. can any tire that fits the rims be used and if so, what tire do any of you think is the best?

thanks for any and all input!!