what do i need to do to submit a skuid application to the app store

Do you mean the AppExchange?

yes, sorry

First step is to pass the Security Review.  This will get you started in the right direction:

https://developer.salesforce.com/page/Security_Review

Doesn’t it cost money to get the security review done? Or is that only for paid apps?

https://partners.salesforce.com/s/education/appvendors/Security_Review

There is a one-time upfront fee, and a small subsequent annual fee for this process. The initial Security Review fee is $2,700 USD for each paid app submitted (no fee for free apps).  This includes the annual listing fee of $150 USD for the first year. If you have questions, speak with your Partner Account Manager (ISV) about Security Review fees.

i should have been more specific. i want to do an unmanged package

the salesforce part of the process seems pretty simple. what i don’t know is how i set it up so it has skuid trial licenses ?

You won’t need Skuid trial licenses if installed in a Sandbox, only if installed in a Production Org.

Will your package will have a dependency on Skuid?

yes, the whole thing is skuid forms