There are psychic exercises you can do to master astral travel between dimensions and get the help you need. The most valuable exercise available in my opinion is meditation. Meditation is the process of complete relaxation of body and mind. Personally water has always helped calm my mind (going back to my coming down off acid) so I often meditate in the tub. Once you are fully comfortable and your mind is quiet visualize yourself traveling and being present in your next dimension.
What does the next dimension look like? That is a entirely personal matter! I believe that your next dimension is what you make of it while you spend your time in this reality. When I first got my psychic abilities I was a kind of psychic thug who got off on psychically assaulting unsuspecting people. During this time my next dimension was a pitch black, blood soaked battle field. During this time I would sometimes entertain people by seeing their spiritual self and describing how they looked and what there role was in the spiritual war. Eventually I lost the will to fight in the spiritual war and decided to exercise my psychic power and use it for self improvement. I make an effort to brighten up my next dimension. The photo at the top of my blog showing the sun setting behind mountains is the closest pic I could find to show what my next dimension looks like now.
What is the benefit of traveling to the next dimension in this life? For one you can reach out to spiritual entities and ask them to help you with your problems. They can also help you with your psychic development. It is ok to have several mentors in the next dimension. Most people have at least one Native American spirit guide. The more practice you get with your astral travel, the more you will be able to use your psychic powers to learn hidden information or whatever your goals may be!