Most of the better guides aren't found on this forum. There are custom builders here but they kinda congregate elsewhere. I'll try to give you a few ideas though
1. You can get everything you need, excepting maybe a few tools, from mtnelectronics.com.
2. Pick your host first. Mtnelectronics has several to choose from, or go elsewhere if you know what you want.
3. Once you've picked your host you'll know what size parts to get. Pick an emitter and buy it already mounted on an mcpcb of the appropriate size, at least for your first build. Soldering emitters to boards isn't hard, but its also not necessary most of the time.
4. Once you've got your emitter(s) chosen, find a driver that does what your emitter needs it to do and that fits your host.
5. Don't forget the little stuff, like spacers, alignment rings, maybe wiring if you need it. Thermal paste will be necessary, kapton tape may be.
6. Then it's just assembly. Just solder it all together, really, assuming you've bought stuff that's ready to drop into your host.
This was a very brief overview. Any questions just ask.