Step 1:
First off, you need about 100k which you can get from your starter package.
Step 2:
Go to the I tab , select skilling , more options, then construction.
Step 3:
Talk to Hickton and buy 27 planks for no more than 2k.
Step 4:
Use the conveyor belt hopper with the logs you bought from Hickton.
Step 5:
When you finish making the planks, sell them back to hickton for a 416k profit per inventory.
Also, each plank gives 1800 exp, 3600 on Friday-Sunday, so it's gonna take 3612 planks from 1-99 on the weekend or 7222 on a weekday.