Hi Megan, welcome to BP!!
In terms of a starting point I would definitely network and learn from bigger pockets as much as possible. Knowledge is key! There are local biggerpockets meet ups in the Twin City area that you can attend.
Having anxiety over purchasing a home is very typical and I see it in almost all of my clients. I'm glad you guys were able to purchase your first home! There are definitely multiple tactics you can use to obtain a second mortgage, you can get a HELOC on your current property are use that money to buy another property, you can buy another primary residence and rent out your current home, there are loans that allow you to buy an investment property with a minimal downpayment, etc.
It's great that you guys are able to save 1000/mo! You may be able to perform on a property earlier than expected. What strategy are you looking to utilize and where are you looking to invest? I can help give you some advice on what you could do here in Minnesota or in Western Wisconsin! Let me know what works best and if I can help in any way, good luck in your investing journey!