Hi, it's about the Fallout Walkthrough available on http://www.gameboomers.com/wtcheats/pcFf/fallout.html.
I've made my way through Section 1 to 6. When it comes to Section 7 things seem to be scaled up. Although I've made everything and a bit more I leave Junktown with 600caps. When I'm in the Hub I go to Jake's shop to check his inventory but the lesser weapon cost more than 10000 bucks! the Sledgehammer cost 12000. Well, every items is awfully expensive.
How can I get so much money up to this point please ?

Mainly, picking up quests, scavenging, stealing if the character you've built is so inclined - The usual RPG grind. I'm not aware of any quick ways of making money.

In this case what's essential is training and reading.
Training the game more thoroughly.
Reading a more detailed walkthru from Gamefaq.
Thanks for your answer.

to GameBoomers, Creed.

Hope you enjoy Fallout. It's one of the classics.