I probably wouldn't chime in here but I was asked to. You can't get much better advice than what you'll get from stinky. I disagree with the notion that you can't put a small plant in a big pot, but other than that I don't know what I can add. I've done a little experimenting lately, and the cuttings I've started in 3 gallon pots are doing much better than the ones I put in pint pots, and have been doing so from the beginning. I planted them about a month and half ago, and the ones in the bigger pots just now look like they might need their first drink. They are also about twice the size of the ones I put in the small containers. (Identical conditions otherwise.) It's about time to put the small plants into bigger containers, and I'm wishing I would have just started with big ones. Please note that I am in the minority here, but my experiences are real.

Other than that, here's what I do with my soil plants, and I can't recall ever having a failure except one baffling case in about 6 years.

I use the best quality potting soil I can reasonably find and add 20-30% perlite. For starting seedlings and cuttings, I'll often get soil designed specifically for that, or add about 10% vermiculite and/or peat for moisture retention. No fertilizer for about a month, depending on the vigor and variety of the plant. After 5 nodes have shown they should be able to handle some grow nutes at 1/8 or 1/4 strength. Gradually increase during each feeding to full strength. Thoroughly saturate the soil at planting with nothing but water and a few drops of B1 supplement PH'd to 6.6-6.9. PH is important, but most potting soil should be close enough at the start. When I water, I feed about every other time. I try to look at my plants at least once per day, and I only water if I notice the beginning of wilt. It's important your soil completely dries out between waterings. Air is just as important in the root zone as water. Ventilation is also important, but not critical how it's done. Just make sure air is exchanged, and your foliage gently rustles in a breeze at least some of the time, more is better. Top once or twice if you want em bushier.

In summary: Do what stinky says.