Ditto. That was how I got into it.
Nice to have new boxing blood in here. The 51s are a classic set choice. I am still kicking myself for acquiring then selling off a partial set of signed Ringsides some years ago. I bought the lot to get at the Ray Miller but I really wish I'd kept the rest too. It had most of the possible (living at time of issue) signers. If you're a Ringside fan maybe these will be of interest:
Salesman sample w/Marciano RC:
Contracts for the set signed by Ruby Goldstein, Barney Ross (Topps watermark is in the scan, not the contract), Ray Miller: