I'm newbie but here is my opinion

worth it..(meaning profit)..some
If you start now, you mean ROI timeframe (right?)
Cant really say for sure...depend on many thing.
1. how much you willing to invest ..time and money
2. withdraw timeframe.. you want to hodl or sell it regularly
3. The electricity price on your miner and other expense
4. Coin price

There are many profitability calculator available that you can check as refference
It always go with saying high risk high return ...if you willing keep yourself uptodate with crypto news