Just remember the "riches are in the niches" & partnerships are typically the only ships that won't float.
That being said I'm partial to real estate and real estate note investing, but that may not be for everybody. So here are a few more options that one can make some really good money in, but may need to hire someone with experience until you learn the business. (I would pay them on a piece work basis).
- Window tinting (I would take a training course first)
- Tree trimming (Would need someone who knew the business)
- Roof cleaning (Can get some training, small investment around 10k, with no store front needed)
These are niches with a little less competition in most areas. Then the key is having a really good online presence that drives traffic to your website and keeps your phone ringing.
Again if it was me I would take that 20k and flip a note but not everyone is familiar with or comfortable with that business.