Raiding/Fractals/Strikes might be tough to start as a group of 2-3, but you can look for learning groups until you feel confident enough to just join randoms.

I learned to do fractals from following guild members back in the day, and now that I'm coming back after a 6 year hiatus, I'm just doing tier 2 or tier 3 dailies and enjoying them again. Strikes and raids require a bit more work, but they're quite doable as long as you have a good teacher and can manage your mechanics on top of your role.