Welcome. I would use whatever kind of guitar you have access to. And yes, a LOT of people here fingerpick on steel string guitars. But, there is nothing wrong with fingerstyle on nylon strings too. Classical and Spanish styles are frequently played on nylon. Blues will definitely sound different on nylon... it won't be quite as loud or sassy. Nylon has different sustain qualities... they won't ring as long. But, you can certainly do it and practice the same techniques. I started on a nylon-string guitar and played it for years before switching to steel. Play whatever you can and play it a lot!
