Are you looking to start on methylated or non methylated.
Advanced muscle science, Forerunner labs, iron mag labs, and lgi (among others) have some great non methylated compounds.
Olympus labs, iron mag labs, LGI, and others have great methylated compounds.
Some offer a complete cycle that include your over the counter PCT. However a serm is highly encouraged, especially if you take a methylated compound.
If you're going for methylated I agree with the others that halo is a good starting point (based on research). Others have reported success with methylstenbolone (aka m-sten) on their first cycle as well.
Another good choice would be epi, as mentioned by the others.
Also get a proper on cycle support (if methyl) and proper post cycle. On cycle support is good for any cycle if you're concerned about the sides. And be sure you have all you need prior to starting, you don't want to end your cycle and not have your pct available.
Best of luck!