If you want to get heavy into Premiere, I suggest investing in an approved Nvidia card as using hardware acceleration is where PPro shines. If you have Yellow render indicators, it still might be worth prerendering in the timeline by going to Sequence > Render Entire Work Area.
Alternately, under the program monitor (the monitor that controls timeline playback) there will be an icon of three circles, click this and change your playback resolution to 1/2 (the other choices will be grayed out, they’re really meant more for 2k and 4k footage, don’t freak out).
https://tv.adobe.com/show/switching-to-adobe-premiere-pro-cs5/
Watching these videos will give you some “ohhhhhhhhhh, that’s how I…” moments.