I would like to start from $50,000 now because i have already some of the bitcoin and this is not bad to wait for the future i want to start from this amount for now and if i have some more money in the future i will invest in some altcoin as well but i want to start from this little amount So it may clear to me about the profit and other volatility of this currency.
My suggestion is that do not invest all of this in bitcoins. You should invest 60-70 5 of this in bitcoins and rest in at least 3-4 alt coins. This diversification will provide you protection from the volatile bitcoin prices. In case, you need funds for some emergency, you can cash out the alt coin which is giving good profit. If you invest all money in bitcoins and the prices go down, your investment will get blocked. This is because you will never cash the money in loss. However, in long term, bitcoins will never be in loss.