First and formost you don't want to start too heavy. Think more along the lines of 40-45#. If you go too heavy and overbow yourself you will develop some very bad habits and you and your shooting will suffer for it.
Second, you don't have to spend a ton of money to get a top notch bow. Yo will get lots of suggestions about this bow and that bow and will be dazzled by shiney finishes and pretty woods. There are some very nice looking bows that are great shooters but you will pay a premium for most of them.
The best value in archery right now is from the Quinn Archery Company.
http://www.quinnsarchery.com/quinn\\'s_archery_001.htm David Quinn uses cast aluminum risers made to his specs. and makes his own limbs. I highly recommend a Quinn Stallion in the range of 40-45#. The grip on the Quinn is small and does not lend itself to being torqued. The riser is well balanced and can either be shot off the shelf or with an elevated rest. It is drilled and tapped for a sight or a quiver if you would like to use either one. It is also drilled and tapped for a stabilizer or bow fishing rig.
The Stallion limbs are made with a dual laminations of rock maple (or bubinga for the Classic limbs) and Gordon Glass. They are very simple limbs but don't let that simpleness fool you. They will perform with the best of them and are exceptionally smooth. (try an average of 2# per inch out to 31"!!) You can get fancier looking limbs but you can't get them any smoother.
My Stallion shoots an arrow at about 176fps with an 11gpp arrow. If you want speed for 3d shooting the Quinn limbs will handle light weight arrows without complaint.
I have a set of the standard maple/black glass limbs as well as a set of the Classics which are bubinga and clear glass. The Classics are real lookers and ther performance of both sets of limbs is fantastic.
The best thing about the Quinn bows is that they don't cost a fortune.The Classic will run you less than $300 brand new. That will leave you with money left over to buy some good arrows and some training if you can find it. Or a second set of heavier limbs for when you are ready for them.
The Quinns are also fantastic people to deal with.
You can certainly spend more for a bow but you won't see the payoff in shootability or performance.