You're off to a bad start dood.
If you have to ask how strong you can get without juice, then you've already shot yourself in the foot.
If you have to ask how strong you can get, you'll never know.
Decide, that you can take it all the way, and that's how far you'll go. Without that mind set, without the heart, you'll never get anywhere, clean or not. All the juice in the world won't make up for a lifter that doesn't have what it takes mentally.