To clear a few things up:
1) You can connect the Spider V via USB directly to your laptop, which will serve as a digital connection to your laptop. This enables you to record your guitar through the Spider V directly into Cubase LE.
2) You do not need any adapters to do so, a simple USB cable is sufficient.
3) Even though it is a version with reduced features, Cubase LE is still a very powerful software that allows you to produce full-fledged songs. I highly doubt that you will be able to just wing it. If you want to keep using it, you will have to study the manual or watch some video tutorials video tutorial about the software. This is not a self-explanatory software, where you just press a button and are up and running within 2 minutes if you have never used it before.
4) Note: If you want to record signals through a microphone (i.e. vocals) you can not do that with the Spider V. You will need a separate USB-Audio Interface which features XLR-ins, a preamp to power the microphone and phantom power for condenser mics.
If that is your goal, a cheap option would be the Steinberg UR22 mkII:
https://www.sweetwater.com/store/detail/UR22MKII--steinberg-ur22mkii