Mine are all around the same size too. If you have good soil, than your plants don't need any nutrients for the first 2-3 weeks. If you want you can give them a 1/4 strength nutrient just to be safe, or around half strength after 2 weeks. Personally i gave my plants some Worm Casting compost tea and some B-1 transplant solution, just for a little kick start. As for the weeks to come, you're going to want some bigger pots if they are outdoors, a 15+ gallon would be ideal, but a 5 gal. will work too. If you have money to invest in everything, Get a decent soil mix like 1/2 compost, 1/4 vermiculite, 1/4 perlite or 1/2 potting soil, 1/4 vermiculite, 1/4 perlite. And for nutrients, you can get any sort of base nutrients, organics will make your weed taste the best. Botanicare Pro grow and pro bloom are good for starters as they are cheap and easy to use, and you can't over feed with them. I am pretty noob myself but if you need some advice I can probably help, I have learned a fair amount since last season