K.Z.
Welcome to gardening! It's a great thing to do.
You mentioned the strawberries having had berries. Did you eat them? If so, great! Don't expect much change in the strawberry plants after that, they may grow just a bit, but mine never went like gang-busters or anything like that. They just sort of sat there and stayed green, didn't make any more berries until the next year (now some varieites are ever-bearing, that means they will make multiple crops in one summer--I don't know what yours are). If you didn't eat the berries, and the berries have vanished, maybe the birds got them; in any case it doesn't sound like you have to do anything to "save" them. I'd just leave them alone for a bit.
I don't grow rhubarb, so can't help you there. If it is too much water, leave off for a little while and see what happens. Do check for bugs, if you see something eating the rhubarb, pull it off and get rid of it.
Also, I don't know if you have this in NM, but in Ohio we have what is called the "County Agricultural Extension Agent", it is through the university. This person can help answer gardening questions. If you have them they can be a good resource because they are familiar with local conditions. (I live in NE Ohio, rather different from Albuquerque!)
If you followed the planting directions for the rhubarb with regard to spacing, I wouldn't thin it. If, however, you planted it too close together, then maybe thinning it will help.
I would also check your newspaper to see if there is a garden columnist. I know the Cleveland Plain Dealer newspaper has one. You could ask that person your questions.
You could also try local garden clubs and nurseries. Most people are happy to share their knowledge, and you might make some friends as a bonus.
Hope that helped!
Good luck and have fun!
K. Z.