I would at least split the vanilla beans, so that you can extract more from them. You might want to start with a single bean too, not two. If you don't get the flavor you're looking for after a couple of weeks, add the second bean. I would advise tasting after a week. I would also do the bean while still on the yeast cake. That way, you only rack one extra time, to get off the vanilla beans and onto the oak chips.
For oak chips, you might want to add those after you get the vanilla into the brew. Depending on the toast level that is. Depending on how much oak you're going to use, will determine how much flavor you'll get, and how fast.
For treating the oak chips before putting into the brew, I simply boiled some water in a tea kettle, and poured enough to cover the chips, in a [sanitized] jar. I then covered the jar and let them cool to room temp before pitching the entire thing into the brew. No point in tossing the oak tea, since that's at least part of what I was looking to get into the brew.
I had a brew sitting on 3/4oz of medium toast chips for 5.5 weeks... I tried it after about two weeks and it wasn't ready (had another brewer taste it too) Figured a month, or more, would be good. Bottled the batch three weeks ago and put two bottles into the fridge today to chill down and try out in a few more days (or over the weekend)...