If your wife is on it, you might want to make her a co-trustee anyhow so she has all the same powers to manage the trust property as the trustee and holds legal title over trust properties. A trustee can also be beneficiaries. Beneficiaries are simply those that benefit from property held and controlled in the trust by the trustee and any co-trustees.
Lifetime beneficiaries are those that benefit from the property held in trust during the lifetime of the trustee. These can be temporary or permanent, depending on how you set it up. Friends, family, or even strangers at the range are beneficiaries that benefit from the trust property during the grantor's lifetime.
Remainder beneficiaries are those that only benefit from the property held in trust at the end of the trust term (your death or incapacitation, or however the trust is written).
When I modify my trust, the first page of my trust document states my trust name, with the creation date (the creation of the first iteration of your trust), followed by a "restated X X, XXXX" which indicates an updated version that supersedes the previous versions since it's a revokable trust and the grantor can restate it. Just make sure you keep the SAME trust name or if the ATF pulls all your Form 4 records with the attached copies of your trust sent with each form, they'll see what is legally two different trust entities, so if you created the "zignal zero trust", when you restate it, keep the same "zignal zero trust" name when you do all future paperwork. Changing that means you've created a different trust.
I'm not a lawyer, blah blah legal disclaimer. Consult an expert.