Although for a 1st timer running it at 75mg to start wont hurt and then if your doing nicely bump it up to 4 and maybe even 5 later on down the road. Always good to access things gently when trying them out..
I would add some D-spark in there as well as it would stack nicely with HCGenerate. Also, an anti-estrogen like formastanozol, erase, etc would not be a bad idea either.
Save bridge for after PCT. Add phytoserms to HCGenerate and that will be a great PCT. discounts and info for Phytoserms in my signature, so check it out.