Well, the first thing i will do is caution you - pursuing psychic abilities as an end can be a huge distraction to real growth, and can lead to a sort of megalomania.
Now on to the goods:
Use guided breathing to respire through your third eye (and the rest of your chakras) - this helps unblock and open it.
Do lots and lots of yoga, incorporate mudra. (try and incorporate kundalini yoga once you are able)
Learn tai chi
Go vegetarian, it really helps, atleast at first.
Meditate lots. (especially guided and visualized meditation)
Learn to trust your intuition. (learning tarot is a good way to do so)
Take monatomic gold (although the danger of going a bit nuts is quite real, and while im not sure how legit the science behind it is - it DOES work in my own experience). Etherium Gold - English
Start taking melatonin to "re-activate" your pineal gland.
Do sun staring. (Be VERY careful and do this correctly, but it works very well) Sungazing - Wikipedia, the free encyclopedia
Read "hands of light".
Smoke or make a tea from the herb Mugwort regularly.
I have done all of the above over the last 5 years in varying amounts and combinations and it has either worked, or driven me completely mad.
Remember though, you can do all of the above to learn how to be psychic, or just focus on being in your heart and feeling as much love and gratitude as often as you can - the results will be the same, but you will be a more balanced person if you focus on your heart.
Good luck, and have lots of fun exploring!