Putting aside any design questions, if what you are after is just to get your mix to germinate well and grow to the extent that it out competes the plants that are currently growing there then you can 1)wait for early spring 2) do a very shallow tilling to uproot the existing vegetation 3) soak your seed mix in water for a day or so to start the germinating process 4) sow your seed.
If they are native-ish wildflowers then everything else should self regulate, but you will inevitably get some "weeds" in the patch which is just more bio-diversity, eh. As paul says there is a lot of grey area there as to what it will be in the end depending on what seeds you have and such, but that would give you a good start. Some seeds need to be scarified or don't germinate the first year as a survival mechanism and there are countless other variables. You might think about flattening that strip a little bit if it's on a slope so that your seeds don't just wash out in the first rain.
Best of luck
Rob S. aka Blitz wrote:
Oh no roundup for me, never!!
The strip Im working on is about 100 feet long and 5 feet wide. Are you saying that I shouldnt do the entire section but just small parts of it? The hardest part is getting all of the existing thick vegetation out of the way so I can get to the earth.