Andras is pretty intense indeed. He is awesome for baneful magick, but certainly not beginner friendly
This is a tutorial for an invocation, but I would recommend just reading this as it has some good explanation on how to use the demonic enn and good, beginner friendly pointers on the subject of intent etc… Do not actually start off randomly invoking as a beginner. Because (and I quote a very good point Mr. Kendall once made) you specifically invite an entity of chaos into your life, you have to be ready and willing to deal with that chaos. You can kinda counter some of the effects, but there is no full cleansing and banishing after intentionally opening the door and inviting these enegies/ entities in your life. Especially entities like Andras can cause a lot of havoc in your life, if you are not prepared for it.
Before working with any spirit, my personal recommendation for intense spirits like Andras (or Abaddon or Belphegor or Belial or Samael etc.) is to not start off asking for stuff. They are powerful supernatural entities, you have to know at least a little what you get into before dealing with them. Do some research first on the demon. demonsanddemonolatry.com, occultist.net and blackwitchcoven.com are my personal favorites but there are more good sources out there. Don’t overdo the research though, because the connection with any spirit or god is always personal and is always at least slightly different for everyone so at one point you just have to dive in and see for yourself. (plus sometimes people seem to project
After that connect to the energy, for instance by meditating and chanting the demonic enn for that demon and see and feel how you react to that energy a few times. You can offer them something if that feels right. But I don’t make that much random offerings, other than my effort and maybe burning a bit of incense in their honor.
If this doesn’t seem like something you want to do, you can totally discard it and dive in anyway. It is just my personal recommendation. I certainly didn’t start easy and dove right into working with some intense spirits as a beginner. Luckily the chaos I invited only made my life better
However, from that experience I can certainly see how that can do some serious damage in a lot of cases.
If you have a specific spell in mind, you can connect to the Andras energy to assist you. You can do that when chanting the demonic enn for Andras and after that opening the sigil. Perhaps write a petition on the back of it in which you ask for his specified assistance and burn it after the spell is done.