Welcome to wheel building
Also, congratulations on one of the best ways to be a weight weenie, 60 lbs is a great weight loss.
Some thoughts on building wheels:
1. Read as much as you can. Some suggestions include: All of this wheelbuilding thread, Mike Ts Wheelbuilding Blog, The Bicycle Wheel by Jobst Brandt.
2. Select the wheel components to align with your requirements & attributes (non-racing, flat, 190lb-ish, etc)
3. Obtain wheelbuilding tools and wheel components
5. Enjoy the ride!
Rims: 50mm carbon seems suitable. For reasonable budget consider Farsports, Bikehubstore/Gigantex, for top end $$$ Enve. Two things to consider: a) Clinchers are less effort to maintain but clincher carbon rims are only just maturing. b) Over 50mm depth can cause issues when cross winds are prevalent.
Spokes: As you rims will be stiff, 20 front radial and 24 rear 2x should be fine. Sapim CX-Ray is a good selection as: popular, no twist problems, strong & reliable. Only down side is they cost more than regular spokes.
Hub: Get a quality & reliable hub. Tune, White Industries, Alchemy, DT Swiss all offer good products. Bikehubstore has a good reputation for budget hubs as well. Select quality/reliability over weight for hubs. Not sure where you reside, but that may influence selection from a spare parts/service perspective.
Tools - There are many opinions regarding the optimum toolset. I suspect there is no right or wrong answer.
About $200 will set you up with the tools below (should last a lifetime):
Truing stand: Range from an old fork in a vice, to a $$$ precision instrument (P&K Lie). I use the $50 Tacx stand.
Dishing: Any cheap one is suggested.
Spoke wrench: Get a good one: Spokey Pro or Unior.
Aero Spoke Holder: Sapim Spoke Holder or similar.
Nipple Driver or an old Phillips screwdriver with two webs ground off.
Parktool Tension Meter.
Grease or oil.
Spoke Lube or Anti-Seize Compound.
Purchasing the wheelset and tools can be easily achieved for under $1500.
Read as much as you can, take your time, have fun.