plane_driva, not to dishearten you but you really have a lot of work to do as you are basically starting from zero. Even if you had been flying VFR, picking up IFR after a long break is hard.
My advice is to find a good IR instructor, get plenty of practice in the sim and get confident before going up in the air. Only regular IR flying will get you back into shape and there are no short cuts. Studying books IMHO is not a practical way to get IR proficient in the air - you've got to get your instrument scan up to speed.
Take copious notes of all the tips and tricks your instructor mentions to you, and you will find yourself building up a substantial but practical manual for yourself on renewals.