You can already start staking now (although I don't recommend buying tickets right now, the price is at an all-time high ... dcrstats.com gives you an idea when is a good time to buy: price will drop), there's a good guide on the Decred Forum. Don't let the command-line scare you, it isn't as complicated as it seems. Go to the PoS part of the Decred Forum, someone even made .bat files that you can run, you just edit a few things... but if you really don't want to do this (keep in mind solo mining requires you to have wallet on 24/7), then I would at least invite you to use the Decred web wallet instead of keeping your DCR on an exchange. Maybe I'm a little paranoid but you never know... an exchange can get hacked, it happened before as you know. Also, you might prefer to mine with stake pools (they're coming out soon too) - which will not require your computer/wallet to be on 24/7.