These recipes assume a typical crafter, which means crafting level 35/35/35. A couple of the recipes can be made at a much lower crafter level, so even if you're just starting out it's worth a look.
Each recipe includes a schedule for what character levels to make it. Because it's so expensive to recreate weapons from scratch, these schedules break it down into its constituent parts. So you might have a weapon with nothing but a suffix on level 3, add a prefix to it (without deconstructing first) on level 5, then an enhancement bonus on level 7. All recipes include a final scheduled pass where you do have to deconstruct first to make the +4 version, which is the best you can get for mid-30s crafting levels. Any pass that requires a deconstruction first is in red.
The idea behind these recipes is to conserve pack space wherever possible, so in many cases the crafted weapon will be "very good" against many mobs instead of "perfect" against fewer. For example, putting ghost touch on the undead weapon instead of Holy means you don't need a separate weapon for incorporeals.
Many recipes require a weapon of a specific material, such as silver, cold iron, adamantine or flametouched iron. Material types cannot be crafted, but they are preserved through disjunction, so to craft one you have to first find any weapon of that material either in quest drops or the auction house.
Once you get into the 60s you can step up the the Holy and Anarchic to their Burst forms and the Banes to Greater Banes, but the level 30 versions are quite nice in their own right. Besides which, the greater versions are now priced too expensive to be worth the trouble until you have multiple capped characters anyway.
Ooze / Rust Monsters: +4 Vicious/Screaming/True Law <bludgeon> of Everbright
Undead: +4 Ghost Touch Flametouched Iron <bludgeon> of Undead Bane
Constructs: +4 Aligned Adamantine <bludgeon> of Construct Bane
Demons: +4 Holy Cold Iron of Chaotic Outsider Bane
Devils / Vampires: +4 Holy Silver of Lawful Outsider Bane
Aberrations: +4 Holy Byeshk of Aberration Bane
Range: +4 Holy Longbow of Bleed
Hot & Cold: Flaming of Giant Bane, Icy of Elemental Bane