My question is while I was looking on redfin, I found a big 14-unit buildings that is for sale around $3 Million.

You don't want to rush to partner just to get your next property.If I was new again now and didn't have the capital to get my second one, I would go to every meetup in my area, meet other investors, and build relationships.

Build the relationship with them.

Make your own signs if you are determined to do this.I'm not a fan of open houses for a lot of reasons, so understand their reluctance to do it, but lots of agents want to do it, so normally in our office the experienced agents don't do them, but there are lots of new agents who have been told this is a good way to build their business.   

They don't buy a lot, and even when they or any affordable housing developer buy land, it often can take forever for them to consider the property and then the actual escrow can be long if they are building the capital stack to buy the property. 

Building the right team of strategic partners is key to effectively completing development/new construction projects.

BiggerPockets has a section just for this, Under the BUILD YOUR TEAM tab- Meetupshttps://www.biggerpockets.com/...Best of luck to you!

I believe my experience in the market can be valuable for both buyers and sellers, but I'm also eager to learn more about building a strong real estate investment portfolio.I'm particularly interested in BRRRR strategy, short-term rentals, and multifamily investing.While I sleep, eat, and breathe real estate most of the time, I also enjoy sports (go Vols!)

I will say depending on the cabin build depends on the savings (log vs hardieboard).

Or can I just start wholesaling until I’ve build enough assets that requires and LLC while developing my business structure as I go along?