>I have very bad focusing problems when I try to AP/Meditate
Meditation will build your ability to focus, both in life, further meditation and in magical activity, as far as magic is concerned that's a main goal of it.
Don't try to AP too early you might burn yourself out trying and failing. Spend your efforts on things that build your ability to work with energy, forces, visualisation and meditation to build your focus.
You can use the lbrp and middle pillar to build what I mentioned above. Have a daily routine of lbrp, middle pillar and meditation for a few weeks and you'll have more luck with more exotic things like AP.
The book in this post has how-to on middle pillar and lbrp >>47073
Use the relaxation script as well to boost your efforts in middle pillar, it hugely improves it being thoroughly relaxed beforehand. ALSO a period of relaxation allows for increased insight to occur as well as spiritual contact.
I would also suggest offering rituals to spirits, this creates a relationship which will hugely build your magical ability. Take an analogy of lending money to a complete stranger or to a close friend, you would lend much more to the close friend than the stranger. Offerings turn spirits from strangers to friends. Add this to your daily routine as well.
I would also recommend looking into developing a spiritual mentor either with the book linked above OR omrans guide here >>52078
This book has a script for offering rituals as well as other magical practise and important theory, you might get on with it better than the new thought stuff, I know I do. https://mega.nz/#!j1JUWCYL!OL89ImKbu7Aq5nXNA4bTzSJLKij054-AD_xqS9vhskg
You should also look up the half lotus asana for meditation, use a pillow or cushion to sit on. Correct posture hugely improves your efforts as well as your physiology.
This all should keep you busy for a good while, by all means research yourself, read more and practise new things as well, but this is a solid magical routine.