And what's Your bodyweight? It gives more perspective on the lifts.
If You just started with squats, I would rather say to avoid 1RM, like dusaboss mentioned. 2-3rep maxes are safer, from there You even can calculate 1RM, if You really need it for percentages. Safer way to go for testing are "two pops"- do 2 reps and increase the weight until You can't perform 2 reps. Another thing is, that for starter it may not be necesarrily important what are Your maxes, while there is probably a lot of space for body's adaptation to the movement. I did by myself a lot of 5x5 (that was always my favourite way to go with all compounds), but most important thing is full range of motion. When You build up to feel comfortable with specific weight for 5x5, increase it by few lbs (5 for example) and do it until You feel comfortable with that new weight at 5x5. Then You increase again. For me it was always good to throw in few weeks of fewer reps (2-4), or few weeks of 8-12 or even 15 reps here and there. In my case full range of motion at squats caused crazy improvement in running pace, too.
Here's the story: Guy from my job, who is 49yo and weights 155lbs, improved his bench press from 110-120lbs to 185-190lbs in 1-1.5 year, by doing 5x5 and occassionally going lower with reps for few weeks. After increasing weight by 5lbs, he did 5x3 or 5x4, and built that to 5x5- then increased the weight. Never trained before, beside playing some amateur football (soccer), casual running (he's naturally good runner, like whole his family) and probably like 1 year in the army 30 years ago... Anyway, chest was his main focus (2x per week 3 exercises + 1x per week one exercise), especially that he has some pains here and there, while going heavier with squats and deadlifts. I'm not sure about his shoulder press, though. By the way, he also got pretty strong back- built pullups from 3 to around 12, I believe (almost full range of motion, just no locking elbows) and does dumbbell rows with 70-77lbs.
P.S. USA provides the world with huge amounts of sources for training, especially military one- thanks to the internet.