you can always buy some mining rig and start mining on your own, that is long-term investment too 

the main rule i use usually consist of "don't be greedy" & "point of profit".
quite simple actually, just decide your "point of profit", and when your coin hit it, just think "is it enough?", if yes then sell, if not then hold
but when you hold, think again "am i greedy?", if yes then hold, but when you fail to make profit because of that, don't be salty because that is your decision.

TL;DR: Those who want to get a lot usually get nothing, well there is some exception for lucky people though.  

oh man, the internet sure is scary when you think about this kind of thing, well just make sure you guys keep your coins safe somewhere like hardware wallet or something 

Well if you want to know about mining, you can read a "lot" here at the forums, you can't expect someone to guide you from A to Z, if the answer you're seeking is not here on the forum, just open new thread, you'll get your answers.

You don't need "How much", you need "How long", because no matter how much you pay for them, the profit depends on your investment, you pay "much" you get "much".
Just make sure you don't invest on the wrong boat, alt-coins cryptomining is very unstable nowadays, just go try bitcoin for your 1st time.

sempet baca-baca dikit tadi, masih agak bingung sama sistem signature campaign, ada yang fixed itu maksudnya tanpa ngapa-ngapain tetap dibayar? trus yang bayarin ke kita itu TS atau perusahaan nya langsung? kebingungan sendiri jadinya 

kalau melihat kemungkinan bitcoin kedepannya, harga sekarang masih termasuk murah, karena fungsi nya banyak nantinya, tinggal tunggu diterima seluruh belahan dunia aja, harganya pasti naik lg  

lebih baik enjoy saja gan di forumnya, berkontribusi apa adanya, jangan bergabung dengan maksud dijadikan sarana mencari uang, nanti lama kelamaan jadi kewajiban, anggap aja dapet bitcoin nya itu sebagai bonus 

hati-hati gan, kalau main trading bisa bangkrut mendadak, pikir dulu yang benar sebelum melakukan