Well first of all I would get a Rainy River/ LOTW chip for my gps, just to be on the safe side.
Baudette is where most people stay in terms of hotel’s and that is about 30 or so miles from Birchdale, or you can go to Ifalls which is about 35 miles to birchdale, or if you really into camping you could camp right at the Birchdale landing.
Fishing areas around birchdale seem to be abundant, lots of good areas within 3 miles or so of the landing down stream, then you have a stretch of shallow water for a little while as you head down stream. Going up stream from Birchdale you run into the Manitou Rapids, where you would have to run thru a set of rapids, this year is low water and I wouldn’t suggest that unless you have a rental boat..
My personal opinion here but your best fishing on the Rainy River is around the Frontier access, lots of great walleye fishing nearby within 3 miles both downstream and upstream. Also very good sturgeon fishing as well.
Its a river system and the fishing conditions can and often do change on a daily basis, so what works one day may not the next, but surrounding yourself near fishy areas will increase your odds, that is why I like the Frontier area personally.
The mother load of walleyes have yet to run up river this year, so from now until close of the season should be very good fishing.
Do you plan on fishing the just the MN side, if so watch that imaginary line down the middle of the river as it will be an expensive fine if caught fishing in Canada with out the proper license or Remote Border Pass. Most of all have fun, bring the camera.