Hello, welcome to the forums kello! Beware of conservative sleepers. I'll answer what I can.
2.How do you get easy juice?
If you don't mind, you can kill people that are easy to kill. Other ways include community service, though that has a very low cap on how much juice it can give you (exactly at 0), so it's only really good for improving negative juice members. There's also disobedience, though there's a good chance that your guy will get beaten by a mob. There's also Graffiti spraying, though you can get caught by the cops while doing so. There's also Hacking, too, but I think that requires computer skill.
3.what weapons the best?
I'm not 100% sure, but I think SMGs are the best overall. However, Rifles (especially AK47s and the M16) are the best per-shot.
4.how do i level my Sword skills fast
Kill LOTS of people, but beware the heat that your guy will accumulate at any safehouse he/she stays at if you murder people with him/her. The best places to kill people are at the Internet Cafe, Juice Bar, Factories, Vegan Co-Op, and Garment makers. A little warning though; the garment maker's security guards carry handguns, and in other places like the internet cafe engineers may also carry guns.
5. How to lose wanted level?
There's no such thing as a "wanted level", but I do believe to loose your wanted status (and thus your heat accumulation) you have to be proven not guilty of the crimes at a court house. Fair warning though; there's no guarantees on wither you'll be convicted guilty or not. And the price for stuff like murder is... well... death. If your liberal gets sent to death, you'll have to break them out of prison or they'll die and their recruiter (or maybe your LCS founder? Not sure) will loose a lot of juice.