Could use a little advice :)

Hey everybody, I’m a bit late to the party.. but I’d like to start taking a little bit out of my wage each week and start dca. Gonna do more research first as I’m just getting into this. I plan on storing in bluewallet, but I’m looking for advice on the best place to buy on iPhone considering transferring fees etc.I heard cash app is good? Thanks. Won’t say no to tips and/or advice either :):)