As far as books go...
White Flag, Union City Shortcuts (50%), Ammo Conservationist (50%) and Organizing Your Home (40%) can all be traded for without too much trouble usually. The "price" of course will vary by the server your playing on (AG/FB or Kong) and who your trading with, but you should be able to acquire all four books with that much fuel by trading -- and have a lot left over.
If you can't/won't trade, then I would prioritize them depending upon your playstyle. If your not being raided a lot, I wouldn't bother with the White Flag. Organizing your home is useful if you're a bit of hoarder, but if you not struggling with inventory space now, I'd bypass this for the moment. Ammo Conservation (30%) isn't worth it imho, though having the 50% version (3k in the store) will be useful in higher levels, where you will need more guns, so i would just save up for the 50% rather than getting the 30% now. Shortcuts 50% is extremely useful if you don't have the DMU (especially if stacked with alliance boosts). So based on what you'd said I'd probably go with that. So the priority order is: UCS 50%, save up for AC 50%, then Organizing 40% and White Flag last. Of course if someone takes a fancy to you and starts raiding you incessantly you may want to bump White Flag up.
As far as crafting goes...
At level 29 (if I'm understanding you correctly) there isn't a whole lot that is really worthwhile, unless you're raiding (which you've said you're not). In a few levels (35) however you'll have access to war hammers, which are a very good melee weapon for played missions. I would save fuel for crafting at a later date if you going this route.
Edited by Zingman, 18 March 2017 - 10:31 PM.