There are a few things to keep in mind with the magazine system if you want to level up quickly. You shouldn't spread your points too thin. Focus on 3-4 perks at a time.
There are perks that you should avoid because they will clutter up your loot table. Master Chef, Living of the Land and Physican should be avoided for the time being because you get the magazines anyway. Putting points into Advanced Engineering sounds great on paper but if you want to have magazines for workbenches Lock Picking is the better choice as Advanced Engineering additionally boosts repair tools, traps and electrics which will clutter up your loot table.
A great source for books are T1 and T2 residential buildings and offices. There you can often find bookshelves and filing cabinets. And quests of course help immensely as you have the chance to get magazine bundles as a reward.