Hello NewB,
There is a legend button on STMS Import Queue screen. All statuses are as follows.
Ready for import again means if you want you can import that request again. In need it is useful.
For your second question;
If you do not put all program in your request requests keeps only the changes. So If you donot import req1 to production system the changes in req1 will not be in production system. If this is the case you want you can import req2 before req1. But this time the changes in req1 can overwrite req2 changes.
It is better to import tested requests to qa and prod in the same import order.
Regards,
Yuksel AKCINAR