write make menuconfig in the source folder, then select "Global Build Settings", then select with a "y":
"select all target specific packages by default"
"select all kernel module packages by default"
"select all userspace packages by default"
This should tag with a "M" all packages for your target/profile, and all them will be compiled.
in the nightly build directories there are config files, copy the one for your
architecture to .config and then run make oldconfig
That will give you a good starting point for your system.
if you use the config right away, you probably don't need the make oldconfig,
but it's a good habit to get into because as soon as you update the lede git
tree, your config may not match the system, so you will need to run it after