Computers are normally 'LISTED PROPERTY' as defined ( listed by the IRS ) and are hard to deduct 100% in the first year.
So, beware.
We are in the early stages of a Great Depression, (GD2), and cash is king.
Be sure to report your income flows on a cash flow basis.
Get out of debt ASAP.
Do not extend credit, leave that to banks.
Many, many EC's will go belly up due to uncollectable invoices.
Save your license: establish income streams independent of the construction industry.
Most advertising will be a total waste: your prospects can't afford your service even if they want and need it.