Hey man youl wanna get them out in mid October or November. As for soil I guess it depends were you are. If the soil in your grow spot is nice a fertile then you wont need to use brought in soil. Like if your growing in a native forest or on volcanic soil Im sure its probably full of nutrients.
Otherwise go for a mixture of potting mix soil and compost is really good. The more organic the better.
In terms of nutrients youl want some higher in N for vegging and some higher in PK for flowering. You can choose liquid nutes hard nutes like pellets etc. For my first outdoor grow last year I mixed pellets into the soil high in N and just fed in liquid nitrosoil during veg. At the start of flowering I used Thrive fruit and flower and towards the end I used another one which has NPK 3.14.14 and stopped feeding it a week before harvest. Anyway Im not overly experienced, last season was my first grow ever
If you can find Nutrients that are organic and not synthetic, youl have a much better taste and product at the end. Im going to try and go for fully organic next season.