just got the pipeline to run 

Nice!

using the default queue okay?

Using the default queue is fine. The different queue is the "services" queue that by default the "trains-server" is running an agent the will pull jobs from there.
With "services" mode, an agent will pull jobs right after the other (not waiting for the previous job to finish), as opposed to regular queue (any other) that the trains-agent will pull a job only after the previous one completed .