There's a "Tools" link at the upper right of the page with Scotty's recommendations for many tools and products. 

He likes these:

https://www.amazon.com/dp/B01AXBB2VG?tag=scottykilme0c-20&linkCode=ssc&creativeASIN=B01AXBB2VG&asc_item-id=amzn1.ideas.LCVG60DVP11Z&ref_=aip_sf_list_spv_ofs_mixed_d_asin

Might be better to get a portable jump starter. That way you don't need someone else to jump start you and you don't have to worry about things like accidentally putting cables on the wrong way which can fry vehicle electronics. (Modern jump starters have protection for cable reversal.)

No less than 4awg, but 2awg is better for those challenging situations (dark, cold, stuck in the rain) when you need every amp.

The cables need to reach from your battery to a helper's battery in the worst case scenario (side-by-side. batteries on opposite side of vehicles). So probably about 16ft.