I wish I had been here from the start of this thread.
First of all, never download Mods from the steam workshop. It is a bad idea overall, and the mods there do not get the same updates and attention that mods on the nexus do. There are many other options out there to ensure safety when modding like Mod Organizer, Wyre Bash, TES5Edit and so forth, but for now, just download the nexus mod manager, and download that way. Mods from the steam workshop just don't get the support and, frankly, it will leave you high and dry when it comes to the best mods.
Secondly, your laptop is going to heat up, that is totally normal, unless you buy something that will attach to the bottom and actively cool it, then honestly don't worry about it. 70 degrees Celsius is perfectly acceptable for CPU/GPU temps, but it will feel very hot on your legs
.
Third, there are ways to adjust your .ini files so you can run the game with an ultra settings feel, and get better performance. If you'd like, in the future I can show you how awesome and simple this process is.
Ask any question here, no matter how dumb it may seem, it took me a long time to really figure out the ins and outs of modding, and I work in the IT industry and have for years.
Before you get too far into your current playthrough, just read a lot, ask questions and learn as much as you can. You do not want to put 80 hours into a character and find out you can no longer use that save. I've been there, done that, and it sucks.
Modding will change your life in the world of tamriel. Just make sure you learn the basics first. Post the kinds of things you want to add to your skyrim experience, and I (along with many others here) would be more than happy to help you make skyrim EXACTLY how YOU want it to be. Trust me, I love this kinda stuff.
You found a great deal on a killer laptop. Make skyrim awesome! It takes patience but it is worth it.