Is there a way to rebuild one's characer. Since I never played this game before some of my choices are uninformed and I want ot correct them.

If you're on pc there's some console commands that can reset ya perk points, otherwise nope, no way to respec.

If you're okay with just playing more, you can always add more points to a SPECIAL stat and start taking different perks. There's no "wrong" build for this game.

Yes, I'm on PC. Which conaole command is that?

Commands can be found here.

http://fallout.wikia.com/wiki/Fallout_4_console_commands

As well as the wiki to find item ids/general knowledge. Be careful of spoilers when reading stuff, if it bothers you.

http://fallout.wikia.com/wiki/Fallout_Wiki