Is Soy the same as Rape? I know lab-lab is a brassica, but when you say "soy", is it a similar plant? I don't think you mean soybeans, but let me know if I'm wrong.

As far as planting clover, spring and fall are best, because you need moisture. I've done both with good results. There is a ton of good information you can get on planting it, but the best advice I can give (except follow the soil test recommendations)is to make sure the plot is as level as you can get it prior to planting, and do NOT cover the seed but "press it in" to the ground with a roller, or even your truck/tractor tires. A good, firm seed bed is the key to a thick plot. Lastly, plant one day prior to a rain, or even in a light rain if you can.

I like plots not smaller than 1 acre - with 2 acres about the right size for nutritional benefit. Your village likely has an Ag extension office, where you can have a soil test done. Also, local colleges may as well. If in doubt, call the local seed dealer/store the farmers use, they will point you in the right direction, they will also give you good local advice, that will come in handy. The local co-op has bent over backwards to help me understand things.