As a beginner with no senses or magical skill, you are not likely to get much out of a possession. It’s not as easy as the movies make it look.
There are many ways to get a familiar. They can be given to you by a greater spirit, for example, or you can create one, or you can find a spirit on the higher planes willing to act as one for you.
It depends on the spirit, really, but generally, they will remain around you. though if the familiar was gifted to you, they can be recalled by the greater spirit that sent them.
As for interacting with them, you would interact the same way you would with any spirit, assuming you have the necessary skills to do so.
Banishing is like vacuuming your carpet. It keeps muck from accumulating and causing a mess, and should be done regularly, especially if you live with other people who may be affected by the rituals you do. It should be part of every magician’s toolkit. And sometimes, you just have to kick an unruly or malicious spirit out.
None of that matters. You can wear whatever you want. However, if you choose certain clothes that you only wear for magick, then every time you put them on it will become easier and easier to slip into the magical mindset. They will become a signal to your subconscious mind that you are about to perform a ritual, making it easier to put on the persona of a magician.
Community bulletin boards and local internet sites. Also, New Age or witchcraft shops.
No, it’s not true, and even if it was, it would be an astral mark, not a physical one, so no one would see it unless they had astral sight.
Sorry, but no, there is not. Magick is like anything else in life, it takes time and effort to develop the necessary skills. You can’t pick up a weight for the first time, and suddenly become a bodybuilder. You have to practice consistently, and your own natural abilities, talents, and limitations, will come into play. Some skills will come easier to you than others, but even the most naturally talented people still have to train. Discipline beats talent every day of the week. You can’t expect to run before you can even crawl.