You really do need to contact the trustees for further information.
You might receive a K-1 with your share of the income, gain, deductions, credits, et al., or you might receive a distribution that is tax-free if the trustees paid any and all taxes due from the trust itself.
If you receive a K-1 (1041), you would simply enter the information from that tax reporting form into your own individual income tax return (1040).
