Far more to running a river than the 'newbie' thinks through, especially in 'new water.' That can also be true for the experienced hand at the oars.
Soooo you bought your first drift boat (non-motor) take it to a lake and just learn how the oar strokes work ... and how slow that can be
For context, a normal sized drift boat can easily weigh in at 650 pounds. Load that 'Mother' up and you can easily get to twice that with rower and passenger(s).
If that means beaching the boat and walking down stream so be it; depending upon the water flows (they change!) where you might run it in a heavy flow is not where you want to be in low flows.
End game is you don't want to learn how your boat will handle on moving water. Best yet is take a trip or two with a good man/woman on the oars, watch them go through the 'set up' for fast water, etc. That bit is called: 'Plan Ahead!'
Here's the first of a three part Video on running rivers: https://www.youtube.com/watch?v=ed5Ne_ZyzuQ
Bottom line of this is the river doesn't care, that bit up to you.
Small edit: If you can get a river map (or print off of Google) go for it and take it with you. Mark the RM's, obvious land marks, etc. Quick way to keep track of where you are. An example of this is here on the Rogue River in Southern Oregon. You have a put in/take out (roughly) ever seven miles .. you miss yours and 'deep do-do' time.