OP: yes, a judge can impute income. The judge can also impute income for the ex as well. Based on your limited work experience, it is likely that your income will be imputed at a lower level. As your husband worked throughout the information, he is likely to be imputed at a higher level, even if his bookkeeping is a mess and he hasn't filed a recent tax return. Presumably he has a profession and there is a median income for his profession that could be used as a basis for imputing his income. You might find an articles from the Bureau of Labor Statistics for evidence of this.
(Because THIS information is something that you can provide to your lawyer.) Or an older tax return can be used...