First of all, cryptos are not legal anywhere (i think). They are not regulated by the government so that makes them illegal (kind of).
You can ask your nepal community here to give you some steem or sbd and you can transfer the equivalant amount in fiat in their local banks..
Lastly, you asked about lease or powering it up. That is one tough question.. but i always recommend powering it up.. that way, it remains your money and will never leave you. Leased SP, however will disappear after few weeks and your money will also disappear with it.
If you would like to know your vote value against certain SP amount, please go to www.steemnow.com , tap / click on calculator button. Enter the SP amount and your vote value will be shown there.
Please keep in mind that vote value keeps changing with respect to steem prices.
Lastly to answer you query regarding adopt a minnow, Recently @arbitrarykitten is having a contest. She wants to adopt a minnow that will include full on 30 days of training (2 hours per day). She will let you in all the tricks and tips. And she is one of the most successful steemians i have ever come across.
Hope my detailed reply will help you :) feel free to ask any further questions.
Thank you so much brother :)