Preparing for Square Foot Gardening - Compost

So I just did a bunch of weeding and dumped 6 bags of compost so far into the garden. I have 6 bags of (supposedly) composted steer manure ($25 for 6 say 40-50 lb bags) and 4 of maybe 25 lbs of mushroom manure ($4 each). I want to start planting veg soon so I felt a bit nervous about growing in the steer manure in case it is not fully composted (aged). So that went on the flower garden. And each 4x3 foot raised bed got the mushroom manure. (By the way, I did lime a few weeks ago too.)

Here's the thing. We did a very good job of putting our yard trimmings and veg etc scraps in the compost bin. It was inherited from the previous owners and the sides had already popped on it. Anyway, we never ever aerated it! So they popped even more till it broke. So we saved a bucket full with about 2-300 worms in it! And we are paying to recycle it this weekend.

Here's the other thing. I felt ridiculous that the compost I bought has resulted in all this plastic bag waste. This year I am determined to make my own compost! No more wasting around $45 on compost. And no more plastic bag waste.