In Biblical times, piercing and tattooing were signs of slavery. Hebrews were forbidden to sell themselves into slavery to a non-Hebrew, so piercing and tattooing were illegal. It'd be the equivalent of tattooing a Schwashtica (sp?) to your forehead during WWII. It was a cultural law to remind people they were once slaves in Egypt, but now they are only dlaves to YHWH. Getting a tattoo today does not mean the same thing, and Biblical commandments against it should be taken into cultural light. If your tattoo includes a Mastercard logo indicating your bank owns you, don't do it. If it's decoration, go for it if you really want it. Just keep in mind that removals are costly, ineffective, and more painful.
There is a commandment that states that you should not pierce or tattoo your body. It further continues to say that the body is the temple of God, and that the Spirit of God dwells in the body. The Church has also traditionally forbidden tattoos as a defacement of the body.
Depends on your personal beliefs. There are many cultures that tattoo themselves with no fear of Hell. Actually has religious significance for them. But do believe in the Christian belief that your body should be treated as a temple, meaning with respect. Like anything, too much of a good thing can turn bad.
As long as you are truly living for Christ, and have accepted Him as your Lord and savior, you will not go to Hell. The only unforgivable sin is blasphemy of the Holy Spirit. Otherwise, we all fall short of the glory of God, which is why it's important to keep our eyes on Jesus. For we are told that He is the way, the truth, and the life. No one comes to the Father but through the Son.