I believe future is for BTC and my investments will mostly on it. I wanna use Electrum as my main btc assets storing. As i heard exchanges is not safe for storing purposes.
Electrum is a recommended wallet for storing BTC, but it is worth mentioning that it is an online wallet, so if you are going to buy a large amount of BTC's, you should use a hardware wallet or use Electrum in an airgapped device.
Also my plan is to invest after that litle by litle for example from my income to invest 100-200$ in month.
That's called the dca plan, and it is a good one, but do not invest more than you can afford to lose.