Overseeding

I have 3.5 acres and about 1/3 of it is fenced pasture that I don't currently use myself. I did have a neighbor run some cows through this year for a couple weeks and it looks pretty good now based on my uneducated eye. I was thinking of overseeding this fall to add aditional diversity of plants and help improve the soil over time. I was thinking of a mix including white clover, vetch, daikon, and some kind of rye grass. I have little equipment but I do have a small ventrac tractor and a pull behind spreader. I was thinking of using a drag harrow with 4 1/2" teeth to prep for the spreading of the seed and then broadcasting the mix. I may be able to find someone to bring a tractor in and disk but it seems to me like this approach might work fine. Does anyone have any thoughts on this approach or on additional species I might consider for the mix?

I think overseeding should be simple. In nature the seed falls, is covered by falling vegetation and when the rain comes it sprouts and grows. In my field I let areas that have the seed I want mature, cut it and move it to where I want to seed and run the mulching mower over it. I have introduced clover by brocasting it through dry grass and then mowing with the mulching mower. I have large areas of vetch so it is the main one I spread by mulch mowing.