I have a few suggestions.
First, I am technical with lots of experience in manufacturing, systems, software (CAD) and some programming. (mostly low level / embedded type programming) Just for context.
Do you have people skills? I got them from the performing arts and various other activities in my life. Basically, if you have a personality and can just engage people, you may be well suited for sales.
Secondly, will you close? This is the qualifier. Lots of technical people will support the sales process, but are reluctant to close. Asking for the business can be extremely difficult for some people.
Based on that qualifier, you may consider pre-sales, which is basically supporting sales people by defining the value proposition, technical proof of concept, discovery, demonstrations, competetive (fun), etc...
Or, you might consider sales and lead others to do your pre-sales support.
If you think you are the latter, you could do very well in enterprise sales as you have technical qualifications that really help you directly understand the deal, it's worth, viability, etc... You can also get some credibility strictly sales only people often find more difficult to establish, though the good ones do establish it by selling their team as well as the software solution.
Suggestions:
1. Consider a VAR. Many VAR type organizations aren't always the best places to work longer term, but they are also more willing to take risks on good people wanting to get into sales. Many are technically hungry and or wanting to improve on their close rates with better / more sales people.
You could approach a VAR for either pre-sales, or sales and perhaps accompany an existing team to learn the ropes. From there, you would get your number and start hunting! Or, you find you are more pre-sales oriented, and join a team and start helping put deals together.
2. With no direct sales experience, you might also consider applying at an enterprise company for pre-sales. This is a more formalized environment, and you will get a lot of exposure to the sales process, network with sales people, and maybe get some opportunities to close deals.
Good pre-sales people can be hard to find. If you are personable and able to communicate complex concepts to people successfully, you probably won't have much trouble.
Startups are a mixed bag, compared to established B2B enterprise companies. Risk is higher, but so is the excitement level.
One thing you need to consider is risk / reward. Many technical people are risk adverse and prefer consistent income. If this is you, target pre-sales.
On the other hand, if you are fairly secure taking some risk, sales can pay very, very well.
Good luck. Have fun!