Conduit is a good way to go.
Minimum depths for different areas , if under a driveway I think 18".
Easy repair/replace/upgrade if ever needed.
Conduit is cheap, (ditch digging is hard) I ran an extra to my shop just in case, ditch is open, easy to do it now
I threw in a water line too. Some day I might need it.
NEC :
For installations under one- and two-family dwelling driveways and outdoor parking areas, and used only for dwelling-related purposes:
- Direct Burial Cables or Conductors need to be 18 inches (450mm) deep
- Rigid Metal Conduit or Intermediate Metal Conduit need to be 18 inches (450mm) deep
Glad you got the wire type & size squared away.
Breaker panel good idea, (some areas require 2 ground rods)
Check with your local power company, most give instruction "hand outs" for how to install.
220/230/240 volts is not "High Voltage" Over 600 volts the classification goes to high voltage.
Welders (welder outlet) require a minimum of #10 stranded copper wire. (current rating on welder determines size)
Usually your biggest current device.
Use a shop-vac to pull a small string thru the conduit (piece of foam on the end.)
Use string to pull a small rope then pull the wire thru.
Easy to cut off extra wire, hard to make it longer (not legal to splice wire in conduit )
You can use the string to measure how long the wire needs to be.
Looks like a good day to dig
Ground still frozen here , but sunny