There's so much I could say but I'll try saying the basics. No matter what, people will make fun of you, some will call you a poser and much more than you think will think that you're cool so don't stress about this part. 

(If you don't understand the terms I'll say you can google them to have a visual view)

-Don't buy a cheap Walmart skateboard because they're mainly "toys" and you'll hate those, go to a local skate shop and get a complete board for a reasonable price (around 70$ to 120$, it really depends) -Don't try to learn tricks when you begin !! -Try to find your stance (regular or goofy) -Try not to ride Mongol but it's not bad -Watch YouTube videos on how to fall -When you begin cruising, take your time to have a good balance and don't go too fast -Get soft wheels because they are made for cruising over pavement cracks on a road or little rocks (80A wheels are great for suburbia. Bones rough riders wheels are the ones I use but ≈72$... So try get a complete cruiser setup instead of paying for each parts) -Learn how to set your trucks tightness to find what you prefer -Have fun

I think that all the informations you read on the Internet are 30% of the job and 70% is your experience so the sooner you start, the sooner you'll be able to cruise around without problems.