How do I start dating again?

I was in a relationship for almost 3 years and I’m trying to get back into the game. Except I don’t really know how anymore. I met a guy I really like who has expressed significant interest but also hasn’t texted me back. I sent him two messages last weekend and he read them on Tuesday. Should I text again and just check in? He has had issues texting back before before we hung out for the first time but still wanted to? Is he just playing games or could he actually just be bad at texting/busy? Also is it okay to “date” a couple guys at once as long as we aren’t exclusive? What are good ways to meet people? Sorry if this is a lot...