If you're new to magickas well, I'd suggest the ' General Info ' section in the forums, and read the pinned posts.
Regarding spells, please do know that magickcan't and won't give you " powers " or make you shoot fireballs out of your hands. Magickis simply a boost to help us achieve a certain goal as long as it is realistic.
Regarding spells, in my case, I only cast them in times of need, so when the time comes, I know which spell category to cast.
There aren't really beginner spells. You can try spells that you know have realistic results, ones you can build your confidence with, and connect with whoever your deity is or who you work with. Start small, that's what I did and it really helps build confidence in your ability and build your connection to your deity. And I find it easier to just talk to them like they're your friend right there with you. Say you are asking for whatever to help build you up.
As the people above me have already stated, there is no real beginner spell. All spells, no matter how "simple" or "complex" all require massive amounts of concentration and visualization.
You should start with learning what magic is and isn't, as this will help you later down the road. This site has many articles about the "basics" or a foundation. This can include visualization exercises, grounding, centering, meditation, and much more.
Also, research is always a good idea so you can find the information out for yourself, and not rely on the opinions and preferences of those who "mentor" you. Doing your own research helps you find out what you like and don't like, and what you may want to include in your practice.