Well then work with what you got, but here's a few tips. Autos are not easier. If anything they may be more challenging. People think they are easier because you don't have to change their light cycle but that's their only advantage. I've grown mostly photos but have started messing with autos lately and have learned some lessons the hard way.
First, either start in your final pot or up-pot quickly. They throw out a fast taproot and if it bottoms out too early it will stunt their growth or even worse, flower early. A 5L pot won't really cut it for most autos, it's not deep enough. They are often more nute sensitive so go easy on them. If you plant in a good, hot soil they won't need nutes until they start flowering. Also, I'd start with one plant in a 10-12L pot and do some LST to fill out your space. I know it's always tempting to go for more plants, but growing one plant well will give you better results. Plus there's a decent chance one plant fills that space completely if you care for it properly.