Dan im sorry im not ending this thread but i have actual useful advice. You dont have to buy a whole set of weights. if you are looking for dumbells just get like a 25 pounder. The amount of reps is a lot more important than amount of weight.
Work your way up from 10 lifts the first week, to 15 the second week. pretty soon you will find yourself doing 70 lifts easy.
Hope i helped you, if not, ehh