Who/where should I reach too for capital.

Do you need a lot of capital to start investing ( here in Denver the market is extremely competitive ) ?

In most cases this requires a capital expenditure that should be factored in a Comparison analysis. 

It's a small one-bedroom unit but super close to the future National Landing.

Being new to this I have a few questions. 1- Do I need to pay capital gains on this money if I don’t use it all as a down payment ?

I was told the seller was installing a new $15K HVAC system (due diligence shows he hasn't quite spent that much on repairs and capital expenses in the past 5 years, despite this being on the market for 2 years).

You could lose this thing as Jay mentions... this was far more common coming out of the deep dark recession.. but now a days builders don't need to do this and if they need to do this means they are either long on jobs or short on capital.   

I am looking to start my career in Real Estate investing, the reason I am starting with Wholesaling is because my lack of capital.

If I renovate during winter, I will likely need to borrow or sell some equities (pay capital gains).

I'd recommend taking some time to educate yourself on the specific area you are interested in and the particulars about how foreclosures work before deploying any capital or trying to do a deal.