I would recommend trying out second hand options near you, bringing someone who knows (a bit more than you) about basses.
Good brands to try out are yamaha, ibanez, Vintage, Squiers (especially the vintage squier) or cort. I know these are not the cheapest brands, but the best starters imho.
as for an amp: try a peavy, or a small ashdown if you want to rehearse with them in a band context
else try a london city or warwick blue cab (the 30 not being powerful for rehearsing)