help with pot size

hey guys

i wanted to know 2 things real quick
im going to start growing 3 or 4 plants outside in pots with soil , water , sunlight , and fertilizer.

first thing i wanted to know was im using 8Lt - 10Lt pots i wanted to know if its ok to pop the seeds in those pots right after germination or should i first use smaller pots then transfer them when they get bigger.

second thing i wanted to know was wats the minimum size pot a plant can flower in and wat would the size of the plant be , wats a good rule of thumb to roughly determine plant size by looking at the size of the pot it will be placed in.

any help any1 ???

As a USA person, ive heard a rule of thumb in US Gallons. (3.8 liters is one gallon) One gallon for every month you grow the plant. If you start it late in the season, and it doesnt grow as large, you can use a smaller pot. If you want a monster plant, use a bigger container. The size of the above ground growth is limited to the size of the root growth.
You can plant seedlings right away in the larger pots, or plant them in smaller pots and move up as needed.