Since you are new to the forum I can understand how tough it is to get used to the forum and the vast knowledge of crypto it has to offer. I suggest you get you bitcoin and ethereum wallets first.
For bitcoin I suggest Electrum wallet for a desktop one. It is the one I use but there are several other ones as well. For Ethereum I suggest Mist wallet as a desktop solution or MyEtherWallet.com which is a web wallet. Remember to keep the secure and NEVER share your Electrum seed words or private keys with anyone. Some ICOs run on Waves platform in that case you need a Waves wallet as well.
Next as far as ICOs are concerned, there are tons of ICOs happening everyday and not all of them will be successful in future. If you are interested in investing in any of them visit their website (be careful of phishing websites, they are very common in flooding the social media when the crowdsale starts and the rush happens) and then when the crowdsale starts send them the amount you want to invest in BTC/ETH/Fiat or whatever.
Most of them will have a token (ERC20 is the most common Ethereum Token, but there can be Waves token as well) which will be sent to you on successful investment - process can take some time keep an eye on the social media links - but be careful of phishing addresses and websites.
These token can now be used for that project for investors to buy the service (most common use) or they can always be traded on Cryptocurrency exchanges.
I hope this overview will be enough for you for now. Remember that this is a generalized scheme and there may be variations. But always remember one thing - Always invest money that you can afford to lose and Never invest more than what you can afford to lose.