So, I downloaded electrum on my notebook, but as I have understood it's better to have a separate cheap netbook offline only to store Bitcoin, is that true?
A raspberry pi would suffice but yes.
In this way I can't be victim of malware and I don't risk that they stole them, am I right? And when I have to use them I just connect the netbook to internet.
I'm talking about 1, 2 BTC, not very much, is that a good solution?
Yes. But you can always use a separate online computer to script the transaction before transferring it to your offline computer to sign it. Then, transfer it back to your online computer and spend it.
Then I saved the 12 words and I used 2 factor authentication wallet (TrustedCoin with Google authenticator, is that safe?)
P.S. If for some case I lose access to the Google authenticator and the netbook, I only need the 12 words to recover the wallet right? So, if that's true, the wallet is also stored online or am I wrong?
If you have other advises tell me, please
Thanks very much for all these answers guys and sorry for too many questions, but I wanna be secure in storing my Bitcoin
P.S. 2: After all, I just send Bitcoin from blockchain.info to electrum wallet address right?
Yes, yes and yes. You can't use 2FA with Electrum offline. Electrum signs your transaction with one of your keys before transferring it to sign with Trustedcoin when authorised.