Since you do not have a gpu yet
Simply spend your time and participate in valuable airdrops and commendable bounty programs to get huge tokens then trade them for bitcoin to buy your mining set
I think this is the best advice for you. I also planning to have mining rig all my earning from airdrop and bounty could help me to buy set. Consider also that bounty and airdrop is profitable as long as you know how to do some research and need some effort.
#Support Vanig
At least you must do a lot of research about how many ROI, the profitability, electricity and maintenance cost. They are important things before try build your mining rig to mine the coin. remember the difficulty is always increase anytime and it could become another problem that gives a huge impact to your ROI.